"I'd rather try to make something useful that other people can get their sound out of," he says. And that's exactly what they've done with the Double Down.

While the Double Down solves a problem Jack himself has had—always on the lookout for a good way to split a boosted signal to two amps—the dual-output preamp will only help you get more of your own sound.

Its simple design lets you send independent gain levels to two different amps. The rest is up to you.