[sdiy] Making an arpeggiator using CGS pedalboard and sequencer?

[dan snazelle]

this sounds like a great idea

i have been toying with various screwed up arpeggiators for awhile now but nothing has worked in a predictable way (though that isnt always bad)
i have never seen the pedal board controller before so i better go check that out


thanks








On Mar 26, 2010, at 1:40 PM, anthony wrote:

> I think I may have mentioned this before, but maybe didn't check back for a reply in a timely manner. My health often keeps me away from my computer - at least for synth-DIY posts. (Ironic I know, I usually sit looking at schematics in bed when I'm sickly...).
> 
> But an idea that stuck in my brain keeps coming up. A relatively simple arpeggiator using a few of Ken Stone's CGS modules and some extra circuitry I haven't quite ironed out yet. It's basically a series of latches that hold the value of the 74C922 based Pedal Board unit and the Gate Sequencer. As you press a key another note is pushed into another latch. At each of these latches is a D/A converter like on the Pedal Board module. The Gate Sequencer would be the simplest way to cycle the notes held in the latches, but somethig more dedicated to the task might be better. As I see it the number of steps would be simply dictated by how many notes you hit and this should be able to automatically select itself. Some sort of counter would work. Once the maximum notes is reached, the first note is purged, etc. A provision should be made to reduce the number of steps in a simple manner, in the case of a full set of maximum steps and you suddenly want fewer steps.
> 
> I have two 74C923's and I'm hoping these will translate well. They're basically the same thing as the 922, except you might be able to have more notes.
> 
> I wouldn't have thought of doing an analog arpeggiator this way, if it hadn't been for Ken Stone's cool Pedal Board Controller.
> 
> I've thought about using CD4044's as the latches, but I don't have very many. Would something like a 74HC373 be a better choice? I have scads of those. Well... I have scads of 74LS373's and the like. Come to think of it the voltage wouldn't be right. Is there a better CMOS part than the CD4044 for a latch that can do 15V? There's the CD4043, but it seems less like what I'd want than the 4044.
> 
> The key points seem to be the latch, loading the latches and moving them along. The way Ken Stone uses the 74C922 seems to make this feel like almost a no-brainer, but... I need brains.
> 
> Cheers,
> Anthony 
> 
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