I'm having an issue with any game that require a microphone. I have all instrument working in rock band 2, guitar hero but when I plug in a mic (and even only a mic), it doesn't work. I just tried out karaoke revolution and I have the same problem.
I'm using hermes 222 and 223, ciox r19 with merge 17 (I don't remember exactly all the details but the one from the guide). Drum work, guitar work, but mic never work (doesn't detect it).