[sdiy] spiral waves (sort of)

[john mahoney]

Richard Wentk wrote:
> At the risk of restarting The Pointless Thread That Wouldn't Die...
[snip]
> That aside it's not very hard to draw a spiral on a scope. Take two sines
> in quadrature, multiple both by a descending unipolar saw LFO running at
> some multiple of the sine period, apply to X and Y and there you are.
>
> This is more use for designing laser shows - where it looks pretty,
> especially when made to pulse to the beat of the music - than to synth
DIY.
> But it's a standard technique, and not something esoteric. Or chaotic. :)

Mythical waveforms aside, let's look at the feasible idea here: a pair of
sines in quadrature. Not exactly a common feature on synths, at least not on
analog synths. Should it be? I mean, are there especially cool things can
you do with this? Maybe some interesting panning effects, or... well, I
don't know, that's why I'm asking. :-)
--
john