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does this pedal exist?

Not that I've ever heard of. You can always run an A/B box into a BOSS TU-2, which acts as a mute and you could switch to either instrument before hand... or you could run an A/B into a Korg tuner, with a mute switch and do it that way... but I don't think there's a single monster to do what you're looking.
 
Not being very helpful, since I don’t remember the name or company, but I remember that there such a thing. It had at least two (but possibly more) inputs which could all be set to different output levels to balance out different instrument levels or different EQ spins, a tuner, and a few other little features. It was marketed towards more high-end touring acts, since they need things like that for all the guitars they have to set up. Try looking for touring equipment product lines.