Short of turning down the gain on an amplifier, and standing away from the amp, what electronic gadget do you use to eliminate feedback from your trumpet mounted microphone? I'm editing this thread to give some specifics about the equipment i'm using. I hesitated to give this information because I know there will be objections to what I'm using, and advice about the equipment to use. But I just want to know what you're using to eliminate feed back. Here goes: I'm using a Digitech headset mic, modified to attach to my trumpet. The XLR mic cord is connected to a 10' 1/2" adaptor that is plugged into a Beringer V-Tone GMX 210 amp. We rarely have monitors, so I like to stay in front of my amp to hear what I'm doing when the guitar and drums get carried away. Of course I stay as far from the amp as I can get. A Channel and Effects pedal is attached to the amp also. I generally have the effects preset to Reverb and Pitch Shifter. Some day I'll get an acoustic amp, and cordless trumpet microphone. But for now this is what I'll be working with. In spite of the equipment I'm hoping to reduce or eliminate the feedback. Kcmt01 gave me one suggestion, and I'm hoping for more.