[sdiy] ARP Sequencers - using more than 1

[Richard Wentk]

At 21:37 18/09/2005, Tim Parkhurst wrote:
>
>Hey Casio,
>
>That's a bit of a tough one. What the ARP does is use a sawtooth VCO as 
>its clock gen. The saw wave is fed to a comparator that creates the 
>variable width clock pulse (a very basic PWM circuit). I think you could 
>accomplish what you're talking about by taking the saw wave out of the 
>master sequencer and feeding it into the PWM circuit of the second 
>sequencer. Then you could have both sequencers driven by one clock, but 
>with the ability to set the clock pulse width seperately for each 
>sequencer. You'd have to add a couple of jacks to the existing sequencers 
>(saw out, pulse comparator in), but the mods shouldn't be too difficult. 
>Another possible solution would be to use an external saw VCO (set to low 
>frequency operation of course) and two external PWM circuits. Then, you 
>just feed the output of each PWM circuit into clock input of one of the 
>sequencers.

Yep. That would be easier than hacking the sequencers themselves.

>I've noted that a lot of analog sequencers don't have a variable width 
>clock pulse. How critical is this?

Musically, it's a nice feature to have.

Even better is to have a spare sequencer channel controlling pulse 
width/note length. But it gets a little complicated at that point.

Richard