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i want to use a pedal for both guitar & vocals, but not at the same time. does somebody make an AB switch like this one that allows true bypass so that both the guitar & vocal signals are never muted, only effected by the pedal in the 1/4" loop?

For as much as you would spend on having this custom made properly (with impedance matching and isolation) you could just buy a duplicate of the pedal and have one set up for each specific purpose.

What is the goal you are trying to achieve and what pedal are you trying to use?

Or just find a wee mixer with variable inputs and an effects loop?

Not reading through the manual and specs but maybe the pigtronix keymaster

Would this be it?
https://www.eventideaudio.com/products/ ... mixinglink

The Keymaster and Mixinglink are just devices that let you run microphones through guitar pedals. They don't have the function OP wants where they switch between the microphone going through the pedals and the guitar going through the pedals.

are you planning to plug a mic directly into pedals? if so, the impedance won't match, and it will sound not great. you'll also lose the balanced connection of the XLR cable. if you're using the XLR output of mic preamp or mixer, you'll also lose the balanced connection. so either way, it makes more sense to use an XLR-to1/4" converter, rather than trying to find a rare pedal with XLR connectors. if you want the box to work as a mic preamp, you'll also need a higher voltage than 9V.

like whoismarykelly said, you're better off buying a second of the original pedal. if you really don't want to do that, you might be able to get a work-alike using a mixinglink and a second selector box (maybe a boss ls2) but you'll need to stomp twice instead of once to get the result you want.

best solution is probably to get a mixer with aux send/return. mic in one input panned hard left and guitar in another input panned hard right. then left output to is mic output and right output is guitar output. but be warned that you'll need one that lets you adjust the panning of the return, or else the effect return will be audible on both outputs. if it's a true stereo pedal then you might be able to get away with that though. EDIT: you'll plug the aux-send into the pedal input, and plug the pedal output into its own channel (NOT the aux-return). that way you can control the panning of the return to make it match the input. the only issue is that on many small mixers, the channel aux-send is not independent of the channel volume fader, so with those mixers you won't be able to mute the dry signal while using the pedal. ideally you'll want a mixer with a pre/post switch for the aux-sends (or even better, separate pre-send and post-send knobs).

keymaster can select between mic or guitar as input if you plug a guitar into return-a, but it won't do what op wants.

Still waiting to hear what the pedal in question is because if its a distortion pedal of any sort the whole idea won't work in a live situation because feedback will overtake the signal before you can get any volume.

Yea, either convert to XLR mic level with a DI, mixer, second pedal, etc. All said before and all good suggestions.

An old high- mpedance harmonica mic might work if it's just for sound effects. Still might feedback and stuff. But I've used my EV one* as the carrier signal into a ring mod for talk box-like and feedback effects (with a booster to level out signals). But using them with any gain that we are used to with guitar is going to be a feedback fest (as whoismarykelly said before).

* don't remember the number and it's in the garage. It kind of looks like the EV605. EV 664 can switch between high/low.

thanks for your your suggestions guys i'll concede that a duplicate pedal for the mic signal might be the best way to go. wanted to add trem to vocals, do you think this signal path would work for that?

I'd just get the Boss VE500 and be done. Especially since it can do some cool stuff in combination with guitar. The chain you're suggesting is a bunch of cash and hassle for what will be a less-than-ideal version of that effect.

if you already have the mic mechanic, then that definitely seems worth a shot! the tr2 can be found for what, $50? and easy to resell too. i don't know how the output of the mic mechanic is set up, so i can't say for sure if it'll sound optimal since it has no level control, but either way it'll probably sound better than plugging the mic directly into the TR2.

word. using a xlr to ts cable from the mic mechanic?