Amplified playing and ringing reeds

I'm totally new to amplified harmonica and am using a Hohner HarpBlaster HB52. When there is a pause in my playing the mic picks up a residual "ringing" of the reeds. Is this something that isn't really a problem because in the context of a band it would never be heard (like the hum of single coil guitar pickups) or do people use noise gates to knock it out.?Or another likely possibility: I am doing something wrong.