[sdiy] waveform animation (was Re: [sdiy] Imperfect VCO)

[john mahoney]

> Producing waveform animation by the use of non-linearities (which are
> computed in the time domain) has been explored much less.

Although they do not use computer-generated non-linearities, the Minimoog
Voyager's VCOs have the cool wave controls. To quote:
    WAVE controls (3) provide continuous control over the waveforms of the
    oscillators, from triangular, to sawtooth, to square, to narrow
rectangular.

There are a lot of wave shapes in between, say, a triangle and a sawtooth.
Varying the wave shape dynamically would be more interesting. I assume (?)
the Voyager's waveshapes can be modulated dynamically by LFOs or envelopes.

Funny thing: This shaping is easy for a digital synth, but I haven't seen it
done before. Leave it to Bob Moog to make it happen on an analog synth.

This technique could use a name. We have PWM for pulse width mod, this is
something like ramp slope modulation (RSM) or wave shape modulation (WSM).
--
john