{"id":7795,"date":"2026-02-02T17:24:43","date_gmt":"2026-02-02T22:24:43","guid":{"rendered":"https:\/\/pugix.com\/synth\/?p=7795"},"modified":"2026-02-02T17:24:45","modified_gmt":"2026-02-02T22:24:45","slug":"logistic-map-chaotic-cv-patch","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/logistic-map-chaotic-cv-patch\/","title":{"rendered":"Logistic Map Chaotic CV Patch"},"content":{"rendered":"\n
\"\"
Generic Patch Diagram for the Logistic Map Patch<\/figcaption><\/figure>\n\n\n\n

I got this patch from a ModWiggler forum thread called Patching Chaotic CV from basic modules<\/a>. It’s on page 1, from user Pelsea, and refers to this Doepfer patch page<\/a>, the Chaos Patch. I don’t understand how it works. My patch was instantiated using a Troms\u00f8<\/a> for the clocked S&H, just the VCA part of Qu-Bit Cascade<\/a> for the first VCA, one section of a 3XMIA<\/a> for the inverting and mixing, half of a 2hp Dual VCA<\/a> for the second VCA, and finally a SSF <\/a>MIXMODE<\/a> for the final Mix to get 4X gain.<\/p>\n\n\n\n

All of the above is to create a chaotic (as opposed to random) pitch step sequence. I did not apply a CV to the second VCA, as shown above in the Logistic Map Patch. I just manually tweaked the 2hp VCA. The patch is very sensitive to the level. It worked with full unity gain, but also with slightly less than unity gain. I tried bypassing this VCA, but then it didn’t work.<\/p>\n\n\n\n

The output of the S&H was used as a pitch control for a sinewave oscillator. On each clock an envelope generator was triggered to control another VCA to make notes. I passed this signal to different effects. In the following, it’s the pitch steps that are of interest.<\/em> They’re not random.<\/p>\n\n\n\n

Through the Holocene Nonlinear Memory Machine<\/figcaption><\/figure>\n\n\n\n
Through the Noise Engineering Desmodus Versio Reverb<\/figcaption><\/figure>\n\n\n\n
Through the Smoothie Audio SMEAR<\/figcaption><\/figure>\n\n\n\n
Through the Desmodus and then through the SMEAR<\/figcaption><\/figure>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

I got this patch from a ModWiggler forum thread called Patching Chaotic CV from basic modules. It’s on page 1, from user Pelsea, and refers to this Doepfer patch page, … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":7796,"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":[189,159],"class_list":["post-7795","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","tag-automatic-music","tag-eurorack"],"yoast_head":"\nLogistic Map Chaotic CV Patch - Richard Brewster'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\/logistic-map-chaotic-cv-patch\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Logistic Map Chaotic CV Patch - Richard Brewster's Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"I got this patch from a ModWiggler forum thread called Patching Chaotic CV from basic modules. 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