Gary: No feedback problems, but I don't sing either. The mic is strictly for talking to the audience. I could see where this could be a concern for singing keyboard performers, but if you look you can see that the mic would actually be blocked from the amp by my head and body... and since I run the mic into the 9000 Pro directly I believe I could use the vocal EQ controls in the keyboard to adjust for feedback if necessary. But your mileage may vary and this setup may not be the best for the singing player.