I know these are stupid questions, but sometimes these things have stupid solutions..
Have you tried a different mike and mike cable? Rule those out before you worry about the arranger. And the Audya has two mike ins, right? You tried both? Same problem?
Lastly, have you done a reinitialization to your Audya?
Apologies for if you have already done this, but sometimes people forget the simple things...
[This message has been edited by Diki (edited 03-15-2010).]