[sdiy] Good times with quadrature waves

[David G. Dixon]

Well, my Small Bear shipment finally arrived with my desperately needed
jacks, and I was finally able to get all my modules into the case and
patched.  I think I've created the perfect wife-annoying machine!

One thing I discovered today: feeding two out-of-phase (by 45 or 90 degrees)
sine waves from an oscillating filter to the FM of two oscillators is pretty
darn cool!  With sub-audio sine waves, it sounds like an echo.  Then, when
you then apply an envelope to the filter cutoff frequency, all sorts of
oscillatory chaos ensues.  It's good fun; you should definitely try it if
you've got a quadrature oscillator -- or a wife.