Dialog still rolling

[Thierry Rochebois]

>> Q)How many oscillators can do thru-zero PWM?  Thru-zero FM?  Not every VCO 
>> design lends itself to these capabilities, does it?
>> 
>> No, but I don't know of any commercial synth that has thru-zero FM. 
>> The 3340 can do linear FM, which is required for DX-7/Synergy type sounds.

>   Erm, what is thru-zero FM?!

Negative frequency i.e. negative phase accumulation : easy to implement
digitally, quite hard to implement in analog (especially with a sawtooth
oscillator).

Maybe a triangle oscillator plus input comparator and control unit will
do that job !?... Any idea ?

Thierry Rochebois