Some time ago there was a discussion on the MaxMSP-forums going on about recreating a specific chaotic oscillator. Actually it goes back to this site: ciat lonbarde, where you can find different sorts of “intuitive analog organs for your atonal/chaos squishing needs” as Peter Blasser, the creative mind behind all this, says.
The website is weird and the instruments are beautiful, so this got me interested.
There is some more information buried there about the “fourses” oscillator which is, well, pretty idiosyncratic and a little mysterious… This is what I think is meant:
I tried recreating this in MaxMSP and ended up coding a little external that does all this (can be found in the Downloads section). Of course this is a digital solution and thus, especially at high frequencies, suffers quite a lot from aliasing.
You can listen directly to the outputs of the 4 ramp generators or use them as playback pointers which read from a wave table or sample buffer.
Here is short example, where the four output ramps are mixed into a stereo file:
And here is a little example where fourses granulates an audio snippet of Cage’s prepared piano: