On Wed, 04 Aug 2010 15:54:42 -0700, Lyle Johnson wrote: >MON is just Tx. For my CM500 I have RP.L BIAS for mic setting, gain is >10. FOr my voice, CMP14 is about right. The CM500 IS hot. I've never noticed, or had complaints, of any background noise. I also run it into the rear panel. Make sure to set the mic gain range to low. 73, Jim K9YC