[sdiy] continuously variable swing

[Colin f]

> From: owner-synth-diy at dropmix.xs4all.nl 
> [mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Byron 
> G. Jacquot
> Sent: 13 July 2005 7:25
> Subject: Re: [sdiy] continuously variable swing

> From my analysis, the swing on the x0x's is done using the 24 pulse 
> per quarter clock.

On all except the 909. The 909 doubles the incoming clock to 48ppqn.
This gives you a problem if you want to start sending bursts of pulses - any
device synced from it that is using some sort of clock multiplication might
be confused.

If I were going to build a hardware swinger, I'd build a DIN sync master
clock generator with a voltage controlled clock oscillator.
By modulating the tempo using a square wave derived from a divide by six on
the output of the clock, making sure to reset the square wave with the DIN
run signal, the tempo could be slowed down then speeded up for each
alternating 16th note, still maintaining the same average tempo.
Make the square modulation depth variable, and you have continuously
variable swing. Make the modulation positive or negative, and you have swing
forward or back.

Cheers,
Colin f