[sdiy] Sequencer - "Human Feel"

[Richard Wentk]

At 21:07 06/02/2006, Tim Parkhurst wrote:
>Just a quick thought on an old thread (Jan 28th):
>
>One proposed feature was being able to vary the leading edge of the
>sequencer clock to 'randomize' the timing a teeny bit, but I don't
>recall anyone coming up with a way to implement this...
>
>You should be able to use a triangle wave, a couple of comparators,
>and a little bit of switching to create a square wave clock where you
>could vary the position of both the leading edge AND the trailing
>edge.
>
>Actually, you could probably do it with one comparator and some logic
>to switch the reference voltage going into the comparator (one level
>for the leading edge, another for the trailing edge). If you did this
>right, you would have pulse position modulation in addition to the
>familiar pulse width modulation.
>
>Any thoughts?

You mean apart from:

>Date: Sat, 28 Jan 2006 20:47:06
>To: synth-diy <synth-diy at dropmix.xs4all.nl>
>From: Richard Wentk <richard at skydancer.com>
>
>Groove control is pretty easy to do. Master clock is an ascending saw. Use 
>a multiplexed row of pots to drive a comparator. Trigger each step off the 
>rising edge. There's a little bit of extra complexity in making sure the 
>pitch multiplexer switches at the right point, but nothing too frightening.
>You get full ahead/behind the beat variability with a reasonable hardware 
>count, and no worries about monostables or other messiness.

Richard