I removed the op amps and put them back, and I don't know if that has anything to do with it. I flipped them around to see if I had them in wrong but no change. For some reason the op amps want to seat deeper on one side so I left them like that, but tried it also with them evenly pressed in first.
Is my powered headphone output on my stx bad?
Flipping the opamps around as in turning them 180 degrees if that is what you mean can damage the soundcard beyond repair. I take it you mean that you moved them to different sockets? From the sounds of it you have sound at the lowest headphone amp setting. If that is the case your headphone amp is fine & you would be having a software issue. If you are using the RCA connection to power your headphone which they will do but won't have much output then all the opamps are fine. If you get sound there but no sound out the rear headphone jack then your headphone amp is blown.
Edited by germanium - 5/20/13 at 10:25pm