Im working on a burning man project, and need to build or find an 8 way switch that can distribute a single input, at speaker power level, to 8 different speaker outputs, one at a time in sequence with a user adjustable speed (~0 - 1200 Hz?). I've already come up with a mechanical switching system, using a 12v cooling fan motor speed adjusted by a rheostat that turns and sequentially triggers an array of momentary micro-switches. However, I think the mechanical "clicking" and the interference noise that's generated by the switches is going to be way too loud. Oh yeah, the whole thing has to run off a 12v power source, that is, a deep cycle marine battery (90 amp hours), so Im looking to minimize power consumption so the contraption will run for a while without sucking my battery dry. The cooling fans use almost .6 amps apiece. Hope there's a better alternative. Ultimately I want there to be two of these switching systems in parallel sending their output to the same set of 8 speakers, but be independantly adjustable (so we can play with the harmonic crazyness, especially if the second switcher is reversed and going the opposite way) Does anyone have any ideas? I've been trying to puzzle this one out for a while. Im not an electrical engineer, more of an electrical hacker... but I can learn!!! I hope to find the most simple, and durable design possible. Thanks!