Getting my Plantronics USB headset’s mic working again

I have a plantronics m2 (I think, the white apple one) which has worked fine with a PowerBook and rev A macbook pro, but the santa rosa, no go on the mic. The headphones work ok.

I had migrated from the old macbook pro to the new one using migration assistant. Apparently some audio preferences got borked and the only way to fix them is via the MIDI setup utility!

Thanks to MacOSXHints and my brother’s recent bout with MIDI setup:

I went to the /Applications/Utilities/Audio Midi Setup.app.

Under Properties For: and chose Plantronics Headet

Then on the Channel “M” (for master) I UNCHECKED MUTE.

Now my headset works fine!