The first new circuit is ready. Buchla timbre generator folds parts of an incoming signal and creates additional harmonic content. This is accomplished by passing the input signal through a series of nonlinearities. Here is the original timbre generator part from 208 complex oscillator:

And here is my veroboard version of it. Signal goes first thru a VCA (not on this veroboard) and then to this timbre generator circuit (added some OP-amplification to get it about 10V pp):

Here are two soundsamples. First is a manual timbre-sweep from sine to extreme. The second is sample and hold modulating the pitch and LFO modulating the timbre:

http://studiomanus.com/Assets/MP3/timbre.wav

http://studiomanus.com/Assets/MP3/timbre_sh.wav

/Manu