in vent setup, set the input device to enable 'use directsound' then set the name to the usb mic name.
in the bose audio manager program (if it has one), try disabling the mp3 input (might also be called 'line input')
in vent setup, try the 'test' function. clik test, hold down ptt, talk, release ptt and you should hear it playback what you said.
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