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When I play two amps, it's always in tandem, I don't switch between 'em. So a delay or chorus with two outs is handy. The problem with this, or with garden variety A/B boxes such as Morley or Whirlwind, is that they don't have isolated transformers, and can introduce ground loop hum. Not a problem if flipping the switch on back of the amp or lifting the ground with an adapter does the trick, but a better fix seems to be disconnecting the ground on one of the guitar cables, on the jack that's plugged into one of the amps. High end switchers such as Lehle eliminate all problems associated with running multiple amps, but fetch big bucks.
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