Got similar issue with audigy 2zs + nForce 2 400 Ultra. Mute microphone makes its volume 0, not actually mutes it. But when unmuted its volume stays at level 0, but not restores level before mute.
Got similar issue with audigy 2zs + nForce 2 400 Ultra. Mute microphone makes its volume 0, not actually mutes it. But when unmuted its volume stays at level 0, but not restores level before mute.