I have read all that I can find on this issue - I have Captivate 4 installed to the current version 4.01 build 1658.
While my mic (Plantronics DSP 400) is recognized by all other applications - Captivate does not. I was using succesfully several months ago - wondering if the NSAudio.dll could be rolled back? Appreciate ANY help and direction on this one as I have a need to complete a project.
Captiv8r - Thanks for the suggestion - I applied the suggested fix within the Link - still no recognition of the USB Plantronics DSP 400 microphone. Default sounds are heard through the headset - the mute button is not enabled on the headset.