Fast VCOs (Wavetables)

[Martin Fay]

Paul wrote:
> I have a module which has 127 waves from the PPG 2.2 and this need to be 
> driven by a high frequency VCO (128* or 64*) , it has sync in and ALSO 
> has CV selection of the wave, so if you have an analog sequencer, bingo, 
> wave sequencing..

Does this switch from reading one wave to the next immediately under the
VC? I use an algorithm where control of the wavetable shifts loop points
rather than the phase accumulator in an attempt to avoid glitching. On this
subject do you know what the PPG does? Is there a crossfade between waves?

Further to this, you wouldn't happen to have any of the PPG ROM data in
electronic form would you? I'm sure those would be very interesting to play
with...I haven't got that deeply into wavetable experiments due to the
effort of creating wavetables by hand and (so far) the lack of time to code
a tool to assist in this task.

> I am now developing a module to "morph" from one wave 
> to another,

Is this an audio crossfade or some other operation?


Martin