Hello Ken, You could try adjusting the parameters below if you haven't already. I found that I needed to " fine tune " them to accept correctly the tones from my Chinese HH while my Icom HH was OK with the default settings. ; name=usb ; devicenum=1 devstr=1-1:1.0 rxmixerset=500 txmixaset=500 txmixbset=500 Regards, Ian..