Hello,
I’ve tried to use the EHX Voicebox live a couple of times and have had very different results than I have had a practice. I am primarily using the Vocoder and the Whistle modes, low gain, no phantom power. I am running a guitar through for the vocoder and the whistle shouldn’t matter one way or another. I am using the power supply that came with the unit.

No problems at practice, however, running through a club PA gives the mic signal massive amounts of hiss and makes it highly susceptible to feedback… but doesn’t seem to be particularly loud. I have tried multiple outlets, unplugging the guitar cables, even unplugging the mic input cable and at 3 different clubs I have still had the problem (to varying degrees).

I usually end up not using it because of time constraints.

Any suggestions? I’m no live sound pro, but is there something I should be doing on the box or with my cables? Mics don’t seem to be the issue (or at least the main issue), maybe it’s something simple I am overlooking?

Any insight would be helpful! Thanks in advance.