I've tried using both my SM58 and Beta 57 mics and got major distortion regardless of how low I set the gains related to the harmonizer.

I then tried an EV MD 431 and found it to be much better than the Sure mic. However, at times, I STILL found some distortion occurring.

A few months ago I gave up on it and bought a used external harmonizer. I'm very happy with it...

Bill in Dayton
_________________________
Bill in Dayton