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Looper's Delight
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>At 9:24 PM -0800 12/9/99, Jax1723@aol.com wrote: >>I was wondering: >>Say you had two non-midi loopers (headrush A and headrush B). Would it >be >>possible to open them up, disconnect the footswitches in A; then hook up >the >>footswitches in B to both units (i.e., one set of footswitches for two >>units)? The $64000 question is: Since both loops are starting/ending at >the >>same time, would they stay in sync or IS THERE SOMETHING INTERNAL THAT >WOULD >>CAUSE THE LOOPS TO FLUCTUATE? > >no, they won't stay in sync. You have some crystal oscillator clocking the >system logic of your headrushes. It is pretty much impossible for two >clock >oscillators to have exactly the same frequency. They will be within some >tolerance, so they will be close, but not exact. Clock oscillator >frequencies will also drift a bit with temperature, age, and the tolerance >of the load caps on the crystal. If you have no feedback mechanism to keep >the clocks synchronized with each other, they will drift from each other. Absolutely true, but might there be some way for the two units to share one crystal/clock? >This means, you'll record two loops that will start off together. As they >loop, the slight differences will cause the loops to slowly drift apart, >causing phase problems, then flamming, then just odd rhythms. Sometimes >this can be obvious very quickly, sometimes slow. Just depends on the >natural random variance between the clocks on the two headrushes. Cool! This is just the way I'd want it, myself.... >This is the whole point of why midi sync exists. Pretty much any device >that is expected to continue running and staying together with other >devices uses it. (jamman and echoplex are two loopers that do.) Before >midi >there were similar control voltage methods that did the same thing on >older >synth/sequencers. Midi sync has limited precision, so on the Echoplex we >took this idea a step farther with BrotherSync. This actually synchronizes >the sample clocks of two or more echoplexes together, so they stay >perfectly in sync. It uses a sort of pll-like feedback system that can >change the frequencies of the clocks in each unit by small amount, >correcting for any error difference between them. Once they find >equilibrium, they stay there. So two echoplexes can stay locked together >very well. I think you can do this in a more limited fashion with midi >sync >on a jamman, although then one unit will have to be slave to the other. > >If this is what you wanted to do, you got the wrong product. Headrush >doesn't have any sync features, it's just a simple pedal not intended for >such use. > >kim No doubt, the wrong product. Personally though, I think I'm actually happier with a Headrush and a couple of Zoom 2100's getting weird against each other than I was with the elaborate EDP. But maybe that's just my problem.... David Myers