>For something pretty hairy, check out an analog alternative to Fourier
analysis/resynthesis using Walsh functions on Tony Allgood's site...
Oh yes, that thing. Yes I really must dig it out again. I never managed
to get the thing in a box. I had a change of tack and decided to build
myself a modular and forgot about it. Yes, I will eventually get the
thing modularized (?). I want to fit a morphing controller on it so I
can control its 31 VCAs with a single envelope generator. I've worked
out how to do it, but its a question of time and money at the moment.
Its sounds very nice really. Closest thing to rival it, is the PPG or
digisound VCDO module. However, its something nice to have two banks of
31 sliders to play with. It also managed to a do very good DX-7 electric
piano!!!
On another topic, I managed to get a saw-tri-inverse saw VCO module to
work as well. We had a discussion about it on the DIY list a while back.
I used Don Tillman's idea of two VCAs controlling an arithmetic minimum
circuit. It worked very well, similar to PWM in some ways. However, the
output waveform suffered from poor DC offsets and it was impossible to
get the design to produce a decent sync, so I abandoned the project for
now. Another one to come back to when time allows.
Regards,
Tony Allgood Penrith, Cumbria, UK
http://www.techrepairs.freeserve.co.uk/