Orion HHCH - buzz on TX

[Thunderknight]

I've got an Orion HHCH (hand held controller) in a dual radio setup. When transmitting, there is a loud buzz (almost sounds digital) in the transmitted audio. The mic audio is there, but it's at about the same level as the buzz, causing the speech to be nearly unintelligible.

This happens on both radios. I swapped in a regular scan control head and it's completely quiet.

So...this means the problem is either the HHCH or the HHCH cable. I only have one of each, so no more swapping parts out

Any thoughts on what might the issue? This HHCH also acts wierd in that when I switch radios (master to slave...it's set to power on to master), the backlighting goes out. Nothing in the personality should cause this that I know of.. If I use the backlight menu to turn it back on, it's fine until I switch back to the master radio, then it goes off again.

I figure next step would be to put a breakout between the HHCH and the HHCH cable and try to scope the mic audio.