I received my new Digimic today and want to clear up some misinformation I read somewhere about the Up & Down buttons not controlling the channels. Those buttons are Duel function for Channels & Noise Canceling Level. There is a button in the middle of them you push and hold to switch into the noise canceling mode to change that level and then press the push to talk button to lock the level in. Then the up & down buttons switch to channel selection. I hope that clears up that misconception.
Happy DXing
Happy DXing