{"id":6884,"date":"2024-07-18T19:38:40","date_gmt":"2024-07-19T00:38:40","guid":{"rendered":"https:\/\/pugix.com\/synth\/?p=6884"},"modified":"2024-07-18T19:38:42","modified_gmt":"2024-07-19T00:38:42","slug":"two-random-eurorack-modules","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/","title":{"rendered":"Two Random Eurorack Modules"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"333\" data-attachment-id=\"6885\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/urr-bagai-pod64\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?fit=640%2C333&amp;ssl=1\" data-orig-size=\"640,333\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721314679&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;32&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"URR-BAGAI-Pod64\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?fit=640%2C333&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?resize=640%2C333&#038;ssl=1\" alt=\"\" class=\"wp-image-6885\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?resize=500%2C260&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?resize=220%2C114&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?resize=250%2C130&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?resize=355%2C185&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-BAGAI-Pod64.jpeg?resize=90%2C47&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Ultra-Random Redux and BAG\u00c0I in a 4ms Pod 64X<\/figcaption><\/figure>\n\n\n\n<p>I&#8217;m going to compare the features and behaviors of two relatively new complex random modules, the <a href=\"https:\/\/modulargrid.net\/e\/steady-state-fate-ultra-random-redux\">Ultra-Random Redux<\/a> from Steady State Fate, and <a href=\"https:\/\/modulargrid.net\/e\/frap-tools-bagAi\" target=\"_blank\" rel=\"noreferrer noopener\">BAG\u00c0I<\/a> from Frap Tools.  There is some feature overlap, but each of these sports some clever ideas.  I&#8217;ll look at each in turn and then do some comparison.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ultra-Random Redux<\/h2>\n\n\n\n<p>The Ultra-Random Redux is a new and revised version of the original <a href=\"https:\/\/modulargrid.net\/e\/steady-state-fate-ultra-random-analog\" target=\"_blank\" rel=\"noreferrer noopener\">Ultra-Random Analog<\/a> from SSF.  The biggest difference from the old URA (which I had, and sold) is the removal of the internal clock.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"254\" height=\"640\" data-attachment-id=\"6886\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/urr-front-panel\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?fit=254%2C640&amp;ssl=1\" data-orig-size=\"254,640\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721314637&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;80&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"URR-front-panel\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?fit=254%2C640&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?resize=254%2C640&#038;ssl=1\" alt=\"\" class=\"wp-image-6886\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?w=254&amp;ssl=1 254w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?resize=220%2C554&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?resize=250%2C630&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-front-panel.jpeg?resize=90%2C227&amp;ssl=1 90w\" sizes=\"auto, (max-width: 254px) 100vw, 254px\" \/><figcaption class=\"wp-element-caption\">Ultra-Random Redux<\/figcaption><\/figure>\n\n\n\n<p>I&#8217;ve decorated the URR with Bananuts to help with identifying the jack functions.  <em>Silver<\/em> indicates the trigger inputs, <em>Gold<\/em> the bi-polar signal inputs, <em>Blue<\/em> the uni-polar CV inputs, <em>Red<\/em> the pulse output, and <em>Black<\/em> the bi-polar outputs.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"707\" height=\"1024\" data-attachment-id=\"6887\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/ultra-random-redux-block-diagram\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?fit=1042%2C1509&amp;ssl=1\" data-orig-size=\"1042,1509\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Ultra-Random Redux-block-diagram\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?fit=707%2C1024&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=707%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-6887\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=707%2C1024&amp;ssl=1 707w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=500%2C724&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=768%2C1112&amp;ssl=1 768w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=220%2C319&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=250%2C362&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=355%2C514&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=730%2C1057&amp;ssl=1 730w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?resize=90%2C130&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/Ultra-Random-Redux-block-diagram.jpg?w=1042&amp;ssl=1 1042w\" sizes=\"auto, (max-width: 707px) 100vw, 707px\" \/><figcaption class=\"wp-element-caption\">Block Diagram of the Ultra-Random Redux<\/figcaption><\/figure>\n\n\n\n<p>I&#8217;ve drawn a block diagram of the URR, above, since the manual doesn&#8217;t have one.  Internally connection of the A trigger input cascades to the B trigger, and B to the Flux trigger.  The Toggle S&amp;H follows the B trigger.  Patching the Random Pulse to the A trigger is a way to kick it all off.  Note: the trigger inputs expect a sharply rising pulse<\/p>\n\n\n\n<p>There are two identical <strong>Sample &amp; Holds<\/strong>, each with its own noise source and rectifier switch.  The signal coming into the S&amp;H can be full or half-wave rectified, or left as-is.  The <strong>Toggle<\/strong> out switches between the two S&amp;H output.<\/p>\n\n\n\n<p>Next is the <strong>Random Flux<\/strong>, which requires a trigger to be patched.  A flux delta knob and CV input control the rate of change.  There&#8217;s also a Flux Probability input that is bi-polar and can influence the flux offset from zero volts.  The Flux output wanders in the +\/-5V range.  How far it wanders can depend on the rate of incoming triggers.  The shape looks much like a wandering envelope generator.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"6889\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/urr-r-flux-scope\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721315581&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;400&quot;,&quot;shutter_speed&quot;:&quot;0.025&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"URR-R-Flux-scope\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-6889\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Flux-scope.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">URR Random Flux trigger in from R-Pulse, and flux output, bottom<\/figcaption><\/figure>\n\n\n\n<p>The <strong>Random Pulse<\/strong> section has an internal free-running clock with a manual divisor knob to select from division by 1 to 128.  The G-Sync switch selects between this internal clock or the clock patched into A or B trigger.  The Density knob and CV input also modify the rate of pulse generation.  I saw no impact of the division knob when triggering from A or B.  The R-Pulse output amplitude is from zero to +11V when free running, but follows the <em>positive<\/em> height of an external trigger input.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"6890\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/urr-r-pulse-scope\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721315316&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;400&quot;,&quot;shutter_speed&quot;:&quot;0.025&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"URR-R-Pulse-scope\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-6890\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-R-Pulse-scope.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Random pulse output in yellow.  Blue is S&amp;H output A triggered from R-Pulse.<\/figcaption><\/figure>\n\n\n\n<p>Finally there is the VC <strong>Linear Slew<\/strong>.  It&#8217;s input is taken from R-Pulse if nothing is patched.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"6891\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/urr-linear-slew-scope\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721315465&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;320&quot;,&quot;shutter_speed&quot;:&quot;0.033333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"URR-Linear-Slew-scope\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-6891\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/URR-Linear-Slew-scope.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">R-Pulse in yellow going into the Linear Slew with output in blue<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Frap Tools BAG\u00c0I<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"298\" height=\"640\" data-attachment-id=\"6893\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/bagai-front-panel\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?fit=298%2C640&amp;ssl=1\" data-orig-size=\"298,640\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721314602&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;80&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"BAGA\u0300I-front-panel\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?fit=298%2C640&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?resize=298%2C640&#038;ssl=1\" alt=\"\" class=\"wp-image-6893\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?w=298&amp;ssl=1 298w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?resize=220%2C472&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?resize=250%2C537&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-front-panel.jpeg?resize=90%2C193&amp;ssl=1 90w\" sizes=\"auto, (max-width: 298px) 100vw, 298px\" \/><figcaption class=\"wp-element-caption\">BAG\u00c0I<\/figcaption><\/figure>\n\n\n\n<p>BAG\u00c0I is my first Frap Tools module. The beautiful aluminum panel has colored etchings that actually are helpful, once you understand all the functions.  Again, I&#8217;ve decorated with Bananuts.  This is especially helpful in the top row where the silver Burst Clock Input stands out from all the outputs.  Notice the CV attenuators sprinkled around.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"766\" height=\"1024\" data-attachment-id=\"6894\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/bagai-block-diagram\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?fit=1290%2C1725&amp;ssl=1\" data-orig-size=\"1290,1725\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"BAGA\u0300I-block-diagram\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?fit=766%2C1024&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=766%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-6894\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=766%2C1024&amp;ssl=1 766w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=500%2C669&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=768%2C1027&amp;ssl=1 768w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=1149%2C1536&amp;ssl=1 1149w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=220%2C294&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=250%2C334&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=355%2C475&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=730%2C976&amp;ssl=1 730w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?resize=90%2C120&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-block-diagram.jpg?w=1290&amp;ssl=1 1290w\" sizes=\"auto, (max-width: 766px) 100vw, 766px\" \/><figcaption class=\"wp-element-caption\">BAG\u00c0I block diagram<\/figcaption><\/figure>\n\n\n\n<p>Note that the GATE block in the diagram is an internal on\/off switch, letting a signal pass or not.<\/p>\n\n\n\n<p>Clearly BAG\u00c0I is quite a bit more complex than Ultra-Random Redux.  Thankfully there is a block diagram in the manual and I have redrawn it with more clarity (to my eyes, anyway).  We&#8217;ll go top down on the diagram, starting with <strong>Fluctuating Random Voltage<\/strong> (FRV).  An internal clock, S&amp;H, and integrator comprise the FRV.  FRV clock rate and probability distribution each have knobs and CV inputs.  Rate CV input has an attenuator.  Probability distribution is similar to Flux Probability on URR.<\/p>\n\n\n\n<p>FRV is also called the &#8220;<em>Global Rate of Change<\/em>&#8220;, since it impacts both random outputs and the burst output, more of which later.<\/p>\n\n\n\n<p>The internal noise source is high amplitude, +\/-10V.  Since it&#8217;s the source for the FRV and also the default source for the Sample &amp; Hold, those outputs have this range as well.  Notice the 10V\/division on the scope, below.  FRV meanders with quite a good shape variety.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"473\" data-attachment-id=\"6895\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/bagai-frv-sh-scope\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?fit=640%2C473&amp;ssl=1\" data-orig-size=\"640,473\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721316254&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;400&quot;,&quot;shutter_speed&quot;:&quot;0.033333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"BAGA\u0300I-FRV-S+H-scope\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?fit=640%2C473&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?resize=640%2C473&#038;ssl=1\" alt=\"\" class=\"wp-image-6895\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?resize=500%2C370&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?resize=220%2C163&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?resize=250%2C185&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?resize=355%2C262&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-FRV-SH-scope.jpeg?resize=90%2C67&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">FRV output in yellow.  S&amp;H output (uncorrelated) in blue.<\/figcaption><\/figure>\n\n\n\n<p>The <strong>Noise<\/strong> output is always available, being passed through a manually adjustable filter.<\/p>\n\n\n\n<p>BAG\u00c0I has two internal CV controlled clocks, low and high speed, both under the same knob and CV input with attenuator.  Everywhere these clocks go internally can be overridden by external clocks.  The single Sample &amp; Hold of BAG\u00c0I can be clocked by either the slow or the fast clock, or an external clock.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Clock outputs<\/h3>\n\n\n\n<p>The internal slow clock is normally connected though a pulse generator, where it can be overridden by the Clock Input, which will only affect the three main clock outputs.  It does not impact the S&amp;H or the Burst (there are separate clock inputs for those).  The pulse generator creates precise 2ms pulses and this is the pulse width of all the three outputs, <em>main<\/em>, <em>plus<\/em>, and <em>minus<\/em>.  Before reaching the main clock output, this pulse must pass a gate that can disable these clock outs.  The gate is controlled by the yellow button OR&#8217;ed with the Clock Hold Gate.  Pressing the button or sending a high gate will pause the clock outputs.  The plus clock out gets additional 2ms pulses that vary according to the FRV.  The minus clock out gets fewer 2ms pulses than the main clock, also varying with the FRV.  So the pulse width remains the same, but the occurrence changes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"6897\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/bagai-clock-sh-scope\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721315795&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;400&quot;,&quot;shutter_speed&quot;:&quot;0.025&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"BAGA\u0300I-Clock-S+H-scope\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-6897\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-Clock-SH-scope.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">BAG\u00c0I Main Clock output in yellow, correlated S&amp;H output in blue<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Burst<\/h3>\n\n\n\n<p>The <strong>Burst<\/strong> output is made from two sources, either of which can be disabled.  The first burst source is a pulse train varied by the FRV and can be gated off by a low gate at the Burst Gate input (normally hooked to a positive voltage internally to enable it).  The second source is the internal slow clock, but which can be overridden by an external Burst Clock, or a dummy cable to disable it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sample &amp; Hold<\/h3>\n\n\n\n<p>Input to the S&amp;H is normally the internal noise, but can be overridden by an external input (gold jack on my panel).  The S&amp;H trigger is normally the internal clock, slow or fast, and this also has a jack to override.  Using the fast clock with an audio input facilitates down-sampling.  The S&amp;H output is passed to a <strong>Quantizer<\/strong> and <strong>Bit Depth reducer<\/strong>, which has a knob and CV with attenuator for the bit depth.  This is available on a separate output.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"6898\" data-permalink=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/bagai-sh-quant-scope\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1721316062&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;400&quot;,&quot;shutter_speed&quot;:&quot;0.025&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"BAGA\u0300I-S+H-Quant-scope\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-6898\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2024\/07\/BAGAI-SH-Quant-scope.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">BAG\u00c0I S&amp;H output in yellow, Quantized S&amp;H output in blue (fewer bits)<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">A Quick Feature Comparison<\/h2>\n\n\n\n<p>Ultra-Random Redux has the benefit of two sample and holds, each with a different noise source, and with optional rectification.  It also has the Toggle S&amp;H output and the separate Linear Slew.  Random Pulse is really random gates and can make digital noise, as well.  Lacks CV attenuators.<\/p>\n\n\n\n<p>BAG\u00c0I has a separate noise output and two different ways of doing random pulses relative to the main clock. The internal clock can run the S&amp;H at two rates, and even run the S&amp;H fast while running the main clock and the burst at the slow rate.  Pulse out width is fixed.  Quantized bit reduction is another added feature.  All the internal normal connections make it simple to get going, while still having many override possibilities.<\/p>\n\n\n\n<p>Each module take a different approach to making a wandering random voltage.  It&#8217;s nice to have both.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;m going to compare the features and behaviors of two relatively new complex random modules, the Ultra-Random Redux from Steady State Fate, and BAG\u00c0I from Frap Tools. There is some &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":6885,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[161],"tags":[44,165,16],"class_list":["post-6884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","tag-noise","tag-random","tag-sample-and-hold"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Two Random Eurorack Modules - Richard Brewster&#039;s Electronic Sounds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pugix.com\/synth\/two-random-eurorack-modules\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Two Random Eurorack Modules - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"I&#8217;m going to compare the features and behaviors of two relatively new complex random modules, the Ultra-Random Redux from Steady State Fate, and BAG\u00c0I from Frap Tools. There is some ... 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