{"id":2049,"date":"2017-01-02T19:50:24","date_gmt":"2017-01-03T00:50:24","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=2049"},"modified":"2017-01-03T08:54:29","modified_gmt":"2017-01-03T13:54:29","slug":"sprott-investigations","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/sprott-investigations\/","title":{"rendered":"Sprott Investigations"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"2050\" data-permalink=\"https:\/\/pugix.com\/synth\/sprott-investigations\/sprott\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?fit=362%2C772&amp;ssl=1\" data-orig-size=\"362,772\" 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=\"sprott\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?fit=362%2C772&amp;ssl=1\" class=\"aligncenter size-full wp-image-2050\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?resize=362%2C772&#038;ssl=1\" alt=\"\" width=\"362\" height=\"772\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?w=362&amp;ssl=1 362w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?resize=220%2C469&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?resize=250%2C533&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?resize=355%2C757&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott.jpg?resize=90%2C192&amp;ssl=1 90w\" sizes=\"auto, (max-width: 362px) 100vw, 362px\" \/><\/a><\/p>\n<p>Here is <a href=\"https:\/\/www.modulargrid.net\/e\/ieaskul-f-mobenthey-sprott\" target=\"_blank\">Ieaskul F. Mobenthy Sprott<\/a>, Peter Blasser&#8217;s filter for Eurorack.\u00a0 Peter&#8217;s manual is, as usual, somewhat abbreviated.\u00a0 I&#8217;ve been experimenting with Sprott and herewith are some of my findings.<\/p>\n<p>Peter describes the module as:<\/p>\n<blockquote><p>The Sprott module is a model of chaotic jerk system with standardized voltage control of all parameters. Thus, the chaotic attractor can be shrank down to distill the module into a resonant filter that is the dynamical sub- circuit underlying most jerk systems. It is named after J.C. Sprott who has published numerous papers, articles and books on chaos and chaotic circuits, from a rigorous physical view-point.<\/p><\/blockquote>\n<h3>Inputs and Outputs<\/h3>\n<p>The arrangement of the panel is deceptively symmetrical.\u00a0 It looks like four similar sections, one above the other.\u00a0 However, they are not perfectly related.\u00a0 There are four signal inputs and four signal outputs, aligned with each other.\u00a0 From top to bottom:<\/p>\n<ul>\n<li>High pass input and output<\/li>\n<li>Band pass input and output<\/li>\n<li>Low pass input and output<\/li>\n<li>Chaos pass input and output<\/li>\n<\/ul>\n<h4>High Pass VCA Controls<\/h4>\n<p>The top section, aligned with the HP input and output, has the controls over a VCA on the HP input.\u00a0 There is the initial level knob, a CV input with attenuverter knob, and a &#8216;diode&#8217; input, which is a second CV input.\u00a0 All of these controls impact the VCA going to the HP input.\u00a0 The initial knob is fully off when counter-clockwise to the left and fully on to the right.\u00a0 Note that these controls over the VCA <em>will have no impact on the outputs, unless there is something patched to the HP input<\/em>.<\/p>\n<h4>Resonance Controls<\/h4>\n<p>The second section, aligned with the BP input and output, has the Q controls, <em>which impact all the outputs.<\/em> There is the initial Q knob, a CV input with attenuverter knob, and a &#8216;diode&#8217; input, which is a second CV input.\u00a0 The minimum Q is the position fully clockwise, to the right, which seems non-intuitive. The range switch just above impacts the BP section.<\/p>\n<h4>Center Frequency Controls<\/h4>\n<p>In the third section, aligned with the LP input and output are the frequency controls.\u00a0 <em>These impact all the outputs.<\/em>\u00a0 There is the initial center frequency knob, a CV input with attenuverter knob, and a &#8216;diode&#8217; input, which is a second CV input. The range switch just above impacts the LP section.<\/p>\n<h4>Chaos Controls<\/h4>\n<p>The bottom section, aligned with the CP input and output, has the controls over chaos.\u00a0 <em>These impact all the outputs.<\/em> There is the initial chaos knob, a CV input with attenuverter knob, and a &#8216;diode&#8217; input, which is a second CV input. The range switch just above impacts the CP section.<\/p>\n<h3>Signal Flow<\/h3>\n<p>Because Sprott has four signal inputs and four signal outputs, if you want to process a single audio signal, you have 16 choices of signal path.\u00a0 Each input produces a signal on all four outputs.\u00a0 And each combination has a different sound to it.\u00a0 You can also patch into more than one input at the same time.\u00a0 The sample recordings, below, will demonstrate some of these.<\/p>\n<h3>Diode Inputs<\/h3>\n<p>Peter says these are the &#8216;least explainable&#8217;.\u00a0 They are secondary CV inputs, one for each section, and seem to respond only to positive CV.\u00a0 They don&#8217;t seem to pass a signal.\u00a0 Try patching a positive DC bias here, and experiment with how it alters the sound.\u00a0 Enough said.<\/p>\n<h3>Levels, Q, Chaos, and Grunginess<\/h3>\n<p>Sprott wants to get grungy.\u00a0 The outputs will get very large and even clip at the power rails levels, when the combination of Q and Chaos are high enough.\u00a0 Self-oscillation is possible, but is chaotic.\u00a0 It can die out unexpectedly.\u00a0 Chaos contributes to self-oscillation possibilities, leading to it even when Q is minimized.\u00a0 Tip:\u00a0 Jogging the Chaos range switch can kick start the chaos, or kill it off.\u00a0 Here&#8217;s an example of self-oscillation, with no signal inputs, but with an envelope into the FM CV input.\u00a0 I twiddle with the Q and Chaos knobs.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-1\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-oscillates-itself.mp3?_=1\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-oscillates-itself.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-oscillates-itself.mp3<\/a><\/audio>\n<h3>Range Switches<\/h3>\n<p>The range switches, from top to bottom, impact the BP, LP, and CP sections, respectively.\u00a0 <em>Yes, they do impact all of the outputs.<\/em>\u00a0 For audio signal processing it&#8217;s best to leave the BP and LP toggles in the middle, for audio rate.\u00a0 However, the CP range toggle can be useful in different positions when processing audio.<\/p>\n<h4>Sub-audio Processing<\/h4>\n<p>Sprott can be used at very low frequencies, as a kind of slew limiter.\u00a0 The following demonstrates control over the frequency of a Denum oscillator by a cycling Swoop being processed through Sprott&#8217;s HP input to the LP output.\u00a0 Twiddling with knobs.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-2\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hp-in-lp-out-slew.mp3?_=2\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hp-in-lp-out-slew.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hp-in-lp-out-slew.mp3<\/a><\/audio>\n<h3>Examples<\/h3>\n<p>Typical low pass filter usage:\u00a0 Patch to HP input, listen to LP output.\u00a0 This example uses a signal made by ring modulating together two Denum oscillators.\u00a0 I manually twiddled knobs.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-3\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hp-to-lp-demo.mp3?_=3\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hp-to-lp-demo.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hp-to-lp-demo.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>Demonstrating low pass filtering with high Q. Cycling envelope on FM CV input. Input is a single Denum oscillator triangle wave, at a fixed pitch.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-4\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-lp-in-out-fm.mp3?_=4\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-lp-in-out-fm.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-lp-in-out-fm.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>Mixing two Denum oscillators, one into HP and one into LP inputs.\u00a0 Listen to LP out.\u00a0 Has a cycling Swoop envelop on the FM CV input.\u00a0 Knob twiddling.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-5\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hplp-mixed.mp3?_=5\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hplp-mixed.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-hplp-mixed.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>Band pass input and output, with added chaos.\u00a0 Also using an envelop to the FM CV input.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-6\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-bp-in-out-fm-chaos.mp3?_=6\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-bp-in-out-fm-chaos.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-bp-in-out-fm-chaos.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>Filtering a very low frequency (&lt;10 Hz) square wave to the LP input.\u00a0 First hear dry signal, then in succession the HP, BP, and LP outputs.\u00a0 With varying amounts of Q.\u00a0 Modulated by a slowly falling envelope on the FM CV input.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-7\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-pulse-lp-in.mp3?_=7\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-pulse-lp-in.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-pulse-lp-in.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>Demonstrating the Chaos Pass input, listening successively to the HP, BP, LP and CP outputs.\u00a0 Signal in is the two ring modulated Denum oscillators.\u00a0 Manually sweeping the center frequency.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-8\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-cp-in-all-out-demo.mp3?_=8\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-cp-in-all-out-demo.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-cp-in-all-out-demo.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>Demonstrating modulating the Chaos CV with cycling envelope and manually varying the center frequency.\u00a0 Not sure which output this was.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2049-9\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-cp-mod-demo.mp3?_=9\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-cp-mod-demo.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2017\/01\/sprott-cp-mod-demo.mp3<\/a><\/audio>\n","protected":false},"excerpt":{"rendered":"<p>Here is Ieaskul F. Mobenthy Sprott, Peter Blasser&#8217;s filter for Eurorack.\u00a0 Peter&#8217;s manual is, as usual, somewhat abbreviated.\u00a0 I&#8217;ve been experimenting with Sprott and herewith are some of my findings. &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/sprott-investigations\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":2050,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_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},"jetpack_post_was_ever_published":false},"categories":[127],"tags":[88,91,159,46,31,28,176],"class_list":["post-2049","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciat-lonbarde-instruments","tag-bandpass","tag-chaos","tag-eurorack","tag-filter","tag-highpass","tag-lowpass","tag-mobenthy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sprott Investigations - 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\/sprott-investigations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sprott Investigations - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"Here is Ieaskul F. Mobenthy Sprott, Peter Blasser&#8217;s filter for Eurorack.\u00a0 Peter&#8217;s manual is, as usual, somewhat abbreviated.\u00a0 I&#8217;ve been experimenting with Sprott and herewith are some of my findings. ... 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Richard Brewster&#039;s Electronic Sounds","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/pugix.com\/synth\/sprott-investigations\/","og_locale":"en_US","og_type":"article","og_title":"Sprott Investigations - Richard Brewster&#039;s Electronic Sounds","og_description":"Here is Ieaskul F. Mobenthy Sprott, Peter Blasser&#8217;s filter for Eurorack.\u00a0 Peter&#8217;s manual is, as usual, somewhat abbreviated.\u00a0 I&#8217;ve been experimenting with Sprott and herewith are some of my findings. ... 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