[sdiy] Digital Waveshape Generator.

[rburnett at richieburnett.co.uk]

> I believe it's standard operating procedure to store waveforms that 
> won't alias at the intended frequencies.  And that this usually 
> involves separate waveforms for each octave above a certain point.  And 
> that's not really a problem because for each octave up you only need 
> half as waveform many entries.

My point was that you don't need to do any of that stuff in a variable 
sanple-rate system. You just have one copy of the waveform's samples in 
memory and play them out at different sample rates depending on the 
required pitch. Yes, the sample rate varies over a wide range, and all 
of the images from the sampling process transpose up or down along the 
wanted pitch, but nothing ever aliases.

-Richie,