Hey there You might recall me asking about the availability of the nifty amp/cabinet switcher made by ampeg. If you've never seen one, they're really quite cool. IIRC, they're a 2 space rackmount unit, on the front of which are two 8 position rotary knob switches (kind of like the selectors on some home stereo receivers for selecting between radio/tape/cd, etc.). Anyhow, you plug the speaker output of up to eight amplifiers into the back, and run speaker cords to up to eight seperate speaker cabinets from the back as well. by turning the first knob you select which amp you want to hear (you have to plug your bass into this amp yourself), and by turning the second knob you select which cabinet you want to power with that amp. a very cool device. unfortunately ampeg only makes these available to ampeg dealers. when i was looking for something similar jmx gave me a link to a similar device. looks cool, but i think i'd like to build one myself with a bit more connectivity and options. essentially, i'd like to build a device for my own use to do quick comparisons of preamps, amps, cabs, basses, etc. If possible I'd liek it to be a rackmount unit, and with the type of connectivity i'm looking for, It would probably have to be 3 or 4 rack spaces high. I'd like to have 3 or four rotary switches like the ampeg has, so i want to know where to find switches like these, some of which are good for speaker level signals, and some of which are good for instrument and line level signals. Anyhow, the idea would be to be able to plug 8 speakers into the back and be able to select between them with one rotary control. Then I'd like to be able to plug the speaker outputs of 8 amps into it (including at least one poweramp) and select between those with a second rotary switch. This should be ok for solid state amps, (as they don't need a load), but a unit like this would need to run all of the unselected amps into a dummy load if you used amps with tube power sections with it (i wonder if ampeg's unit wasn't ok to use with the tube svts?) Then, to improve upon the ampeg unit, I'd like to be able to plug the output from a bunch of preamps into it, and use a third rotary control to select which preamp's signal i sent to the poweramp's input. I'm assuming i might need to use a different switch for that, or will the same type of switch be ok for the line level signal? I'm also assuming that running the remaining preamps into nothing would be ok, (even if they still had a bass signal going into them), or would that somehow damage a preamp if it had a cord running out of it that terminated into infinite resistance? To make the unit really cool, it would be neat to have the switch that controlled which preamp's output was being used select the same preamp's input at the same time (maybe if there were two rotary swiches mounted on the same pole?), so i could have a bass plugged into the unit itself and by turning one knob i could select agiven preamp, running the signal from my bass to its input and running its output to the poweramp all at once. If no such swich exists, then i suppose i could have a fourth rotark switch that selected what preamp's input i ran my bass into rather than having to keep unplugging and plugging my bass (or using an external a/b box). On that same thought, it would probably be cool to have yet another input for the bass and rotary knob that would switch between the inputs of the various amp heads plugged into the unit as well. OF course, if i wanted to get really crazy i could have a bunch of inputs for basses on the front too, but i think that's going a bit overboard. the whole idea is to be able to do quick comparisons of preamps, amps, and cabs. I've found that the longer you spend between listens, the less able you are to make good comparisons. my question? where do i get the kind of switches i'm looking for? and are there in fact multi position switches that would be able to switch two things at once (like the input and output of a preamp)?????? I suppose i should ask where a good place to get the chassis for a rackmount unit is too.