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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. 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. 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 ______________________________________________________________________ Kim Flint | Looper's Delight kflint@annihilist.com | http://www.annihilist.com/loop/loop.html http://www.annihilist.com/ |