{"id":1351,"date":"2010-08-09T21:36:30","date_gmt":"2010-08-09T19:36:30","guid":{"rendered":"http:\/\/macumbista.net\/?p=1351"},"modified":"2010-08-14T14:37:59","modified_gmt":"2010-08-14T12:37:59","slug":"testing-for-chaos","status":"publish","type":"post","link":"https:\/\/macumbista.net\/?p=1351","title":{"rendered":"Testing for Chaos"},"content":{"rendered":"

\"\"<\/a><\/p>\n

The following are tests of the chaotic synthesis system I’m working on, and in no way should be considered “finished pieces”:<\/p>\n

*chaos01.mp3<\/a><\/em><\/p>\n

*chaos02.mp3<\/a><\/em><\/p>\n

Modules used in these recordings:<\/p>\n

Thomas Henry XR-2206 VCO<\/a> (Bugbrand PCB layout)(VCO range)
\nThomas Henry XR-2206 VCO (Bugbrand PCB layout)(LFO range)
\nIan Fritz EZ Chaos<\/a> (Uncle Krunkus stripboard layout)<\/p>\n

In the first example, chaos01.mp3<\/em>, the triangle waveform of the LFO drives the EZ Chaos. The Z (marked NL on schematic) output of the EZ Chaos drives the 1V\/Oct input of the VCO. Both Drive and Rate pots are set about at the middle, and the Damping is totally turned down. As you can hear, it maintains a very steady modulation. The changes in modulation pattern only come from my manually adjusting the LFO.<\/p>\n

In the second example, chaos02.mp3<\/em>, the poti settings and routing remain the same from chaos01.mp3<\/em>. However, I have routed the Y output to the Linear FM of the LFO, and the X output to the Exponential FM of the LFO. The modulations become much more chaotic in this setup. Through the clip, I adjust the depth of the LinFM, ExpFM and the general rate of the LFO. Better, don’t you think?<\/p>\n

For me, the modulation patterns in chaos01.mp3<\/em> sound to me like a non-linear transfer function, but don’t sound chaotic at all in the sense that the transfer function remains almost identical for every cycle of the LFO at any frequency tested.<\/p>\n

My understanding of chaotic synthesis usually involves feedback between at least two–but in my experiments up to 8–cross-modulated VCOs with a non-linear function in the feedback loop. The results tend towards certain attractors, but every cycle is distinct from the previous one, even if after 3 or 7 or 15 cycles you might return to a common origin.<\/p>\n

Assuming that my EZ Chaos circuit functions as it should, the benefit I see out of it would be the ability to make chaotic patterns from a single LFO through the feedback. Normally I would have to use 2 or more LFOs to get the same kind of chaotic oscillations.<\/p>\n

However, by itself I don’t hear chaos coming from this circuit, only non-linearity. It’s the feedback in chaos02.mp3<\/em> that makes it chaotic for me. Looking at a double well attractor on the scope is one thing, but hearing it is the proof…<\/p>\n

Updated info on the chaos circuit as well as some tuning tips can be found on the Elby Designs page for their ED108-ChaQuO<\/a> module.<\/p>\n","protected":false},"excerpt":{"rendered":"

The following are tests of the chaotic synthesis system I’m working on, and in no way should be considered “finished pieces”: *chaos01.mp3 *chaos02.mp3 Modules used in these recordings: Thomas Henry XR-2206 VCO (Bugbrand PCB layout)(VCO range) Thomas Henry XR-2206 VCO (Bugbrand PCB layout)(LFO range) Ian Fritz EZ Chaos (Uncle Krunkus stripboard layout) In the first […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[24,49,15],"class_list":["post-1351","post","type-post","status-publish","format-standard","hentry","category-announcement","tag-audio","tag-chaos","tag-synthesizer"],"_links":{"self":[{"href":"https:\/\/macumbista.net\/index.php?rest_route=\/wp\/v2\/posts\/1351","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/macumbista.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/macumbista.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/macumbista.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/macumbista.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1351"}],"version-history":[{"count":10,"href":"https:\/\/macumbista.net\/index.php?rest_route=\/wp\/v2\/posts\/1351\/revisions"}],"predecessor-version":[{"id":1355,"href":"https:\/\/macumbista.net\/index.php?rest_route=\/wp\/v2\/posts\/1351\/revisions\/1355"}],"wp:attachment":[{"href":"https:\/\/macumbista.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/macumbista.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/macumbista.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}