It looks like there are some USB microphones that can work with the recent Access Grid mac release. Thanks to Dwight Mckay for trying his Plantronics USB mic. Dwight successfully used a Plantronics DA50, so we tried our Plantronics DSP 100 also with success. Of course these are not guarantees of anything, but if you have the same or similar microphones, it would be worthwhile to try them or to wait and see if other people verify any additional microphones that work. If you do try a new microphone, listen closely to make sure it's not just almost working -- where speech from the microphone sounds lower and the audio will skip.
One more note: When using the current version of the rat audio tool for OSX, the selection of a different audio device should be done through the general system preferences, not in the rat user interface, and probably not while rat is running. Eric
