{"id":7542,"date":"2025-08-07T10:21:53","date_gmt":"2025-08-07T15:21:53","guid":{"rendered":"https:\/\/pugix.com\/synth\/?p=7542"},"modified":"2025-08-22T11:20:12","modified_gmt":"2025-08-22T16:20:12","slug":"tetrazzi-in-three-parts","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/tetrazzi-in-three-parts\/","title":{"rendered":"Tetrazzi in Three Parts"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"7543\" data-permalink=\"https:\/\/pugix.com\/synth\/tetrazzi-in-three-parts\/tetrazzi-part-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.6&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone 16&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1753973714&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;5.960000038147&quot;,&quot;iso&quot;:&quot;250&quot;,&quot;shutter_speed&quot;:&quot;0.016666666666667&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"tetrazzi-part-1\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-7543\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-1.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Part 1<\/figcaption><\/figure>\n\n\n\n<p>Three videos, each with a different Tetrazzi.  The first is a performance with the original Tetrazzi Organ.  The second is an automatic running patch of the <a href=\"https:\/\/pugix.com\/synth\/modular-tetrazzi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Modular Tetrazzi<\/a> being controlled by the Quantisise (a Quantussy emulation).  The third will be a patch with the <a href=\"https:\/\/pugix.com\/synth\/large-patchable-tetrazzi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tetrazzi Large PCB<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/ZeaBAWf5KBw?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><figcaption class=\"wp-element-caption\">Part 1 Video<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Part 2<\/h3>\n\n\n\n<p>For the Modular Tetrazzi I made both a video and a separate recording.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"526\" data-attachment-id=\"7544\" data-permalink=\"https:\/\/pugix.com\/synth\/tetrazzi-in-three-parts\/tetrazzi-part-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?fit=640%2C526&amp;ssl=1\" data-orig-size=\"640,526\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;2.2&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone 16&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1754562141&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;2.2200000286119&quot;,&quot;iso&quot;:&quot;640&quot;,&quot;shutter_speed&quot;:&quot;0.016666666666667&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"tetrazzi-part-2\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?fit=640%2C526&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?resize=640%2C526&#038;ssl=1\" alt=\"\" class=\"wp-image-7544\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?resize=500%2C411&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?resize=220%2C181&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?resize=250%2C205&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?resize=355%2C292&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.jpeg?resize=90%2C74&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">The patch for part 2<\/figcaption><\/figure>\n\n\n\n<p>I used the Quantisise to control the Modular Tetrazzi and took the Tetrazzi stereo output through a CGS Serge Wave Folder and a CGS Tube VCA in the blue panel.<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-part-2.mp3\"><\/audio><figcaption class=\"wp-element-caption\">Tetrazzi Part 2 MP3<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/N2Lgl9V1bZo?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><figcaption class=\"wp-element-caption\">Tetrazzi Part 2 Video<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Part 3<\/h3>\n\n\n\n<p>Here I try to play the <a href=\"https:\/\/pugix.com\/synth\/tetrazzi-in-three-parts\/\" target=\"_blank\" rel=\"noreferrer noopener\">Large Patchable Tetrazzi<\/a>.  <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"506\" height=\"640\" data-attachment-id=\"7564\" data-permalink=\"https:\/\/pugix.com\/synth\/tetrazzi-in-three-parts\/tetrazzi-reverb-four-voice\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?fit=506%2C640&amp;ssl=1\" data-orig-size=\"506,640\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.6&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone 16&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1755859432&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;5.960000038147&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=\"tetrazzi-reverb-four-voice\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?fit=506%2C640&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?resize=506%2C640&#038;ssl=1\" alt=\"\" class=\"wp-image-7564\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?w=506&amp;ssl=1 506w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?resize=500%2C632&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?resize=220%2C278&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?resize=250%2C316&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?resize=355%2C449&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.jpeg?resize=90%2C114&amp;ssl=1 90w\" sizes=\"auto, (max-width: 506px) 100vw, 506px\" \/><figcaption class=\"wp-element-caption\">The patch<\/figcaption><\/figure>\n\n\n\n<p>The sawtooth outputs from each oscillator are each patched through a channel of my <a href=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/\" target=\"_blank\" rel=\"noreferrer noopener\">four channel VCA<\/a>, based on the AVDog from Plumbutter.  I used the orange bar voltage outputs from four bars on the Sidrax to control the levels.  The VCA outputs go to a Eurorack attenuator and then through a small reverb.  This Tetrazzi is much harder to play than the Tetrazzi Organ, because the pitches and cross modulations have to be made by hand in addition to hitting the bars to make notes.  With no cross modulation the pitches are clean.  By raising the Upmod or Downmod (gray) pots, cross modulation happens across the board and it gets gnarly fast.  Each oscillator also has two toggle switches that make a two bit binary selection of one of the other oscillators to do bounds modulation on it.  And in this version of Tetrazzi, each oscillator has a knob for rise rate and one for fall rate, whereas on the Organ there are two wheels, one for all rise rates and one for all fall rates.<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2025\/08\/tetrazzi-reverb-four-voice.mp3\"><\/audio><figcaption class=\"wp-element-caption\">An audio recording<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/IhbJg33Sbl4?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><figcaption class=\"wp-element-caption\">An awkward performance<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Three videos, each with a different Tetrazzi. The first is a performance with the original Tetrazzi Organ. The second is an automatic running patch of the Modular Tetrazzi being controlled &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/tetrazzi-in-three-parts\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":7543,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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},"jetpack_post_was_ever_published":false},"categories":[76],"tags":[189,122,138,119],"class_list":["post-7542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-music","tag-automatic-music","tag-ciat-lonbarde","tag-quantisise","tag-tetrazzi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tetrazzi in Three Parts - 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\/tetrazzi-in-three-parts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tetrazzi in Three Parts - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"Three videos, each with a different Tetrazzi. 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