Anyone aware of a vocal FX loop that could be engaged for multiple mics, each controlled separately?

[Benn Roe]

I'm envisioning a box that houses three to four separate XLR signal paths, each with its own input, output, and footswitch, but with each signal isolated from the others. The whole box would then also have a single typical send-and-return FX loop that could be engaged separately for each signal path, using the appropriate footswitch. Does anybody know of anything like this? It's sort of a niche use-case, I guess, but it seems like a relatively simple concept, and could be a powerful tool.

[Gone Fission]

I believe you could use an old Digital Music Corp/Voodoo Lab GCX for multiple parallel paths—the loops aren’t hardwired in sequence as stock, though some users modify them that way. I believe the loops are passive and relay switched, so this won’t do buffering or level matching if you need that. I think Voodoo Lab will still provide stereo cards, two of which would make each loop TRS stereo or you can stop at half.

So that’s my first guess at a device, but how are you running things? Mic preamps? Direct outs from mixer channels? What kind of effects (reverb and delay, compression and eq, other stuff)? Do you have inserts on mixer channels that can be tapped as splitters and extra mixer channels to burn? Aux sends?