Hi Bob, The HM-10/HC-5 will work fine with the IC-756Pro. You can try these initial settings: Bass: -2 dB Treble: +3 dB COMP-ON-MID Compression pot set for 6 dB compression on voice peaks Pro3 Mic Gain at about 12 o'clock Cheers for now, 73, Adam VA7OJ/AB4OJ Scanned for viruses by Blue Coat http://www.WinProxy.com/