I have experienced a fluctuation in gain from the headphone out. Sometimes I need 20% volume to reach full volume and sometimes it's 70% with the same track. The quality of the audio is still the same. Anybody experienced this? Where is this gain switch on the board and how does it look like?
Gain is set by 2 sets of jumper pins, location is shown in the manual. You can't miss them, there are no other pins nearby. It is supposed to ship in low gain mode, with the jumper blocks off both sets. I don't know what would happen if someone goofed and put one block on & one block off. Does the volume change within a track, or is it more like low one time, then next time it's loud? If you are sure nothing is changed in the computer settings, I would suspect an intermittent loose connection.