90-degree phase tri lfo revisited

[Don Tillman]

   From: "jhaible" <jhaible at debitel.net>
   Date: Mon, 9 Aug 1999 01:10:09 +0200

   > ... you never can tell, eg the best thing to modulate a phaser
   > with is a full wave rectified sine wave (in the opinion of some).

   I'd say that's just because of the similarity of the FWR sine on a linear
   CV input and a "normal" sine on an expo CV input.

Or because a phase shifter that tunes like a "bouncing ball" might be
a nice sound, slightly suggesting a through-zero effect.  

(I'm reminded of a classic bouncing ball simulation on the old Heath
analog computer.  It wasn't exactly a rectified sine wave, but it was
close.  One integrator for ball velocity, another integrator for ball
position, full-wave rectify that for the bounce, one integrator for
constant horizontal speed, two integrators for a quadrature audio
frequency oscillator, add that into the ball horizonatal and vertical
position to display the bouncing ball on an oscilloscope as a circle,
a diode flattens the ball as it hits the ground... This was really
cool in the days before computer graphics.  I think it uses up the
entire analog computer!  You can set gravity, frictional loss of the
air, size of the ball, and lots more with knobs.)

But no matter, if a circular pan is what you're looking for, sine
waves aren't a bad place to start, whatever the personal preference
ends up to be.

  -- Don