What's up with that? I just got on LION v2.6 as of yesterday and I'm LOVING it! Incidentally, the sound bug seems to come back from things like an incoming call. I can indeed fix it temporarily by going to Dtux Adiutor->Sound and messing with the gain sliders. I've had to mess with the "Headphone PowerAmp Gain" and the "Headphone Gain" to get it working properly again. Thoughts?