I have the lead to the amp connected to the white and red RCA connectors on the sound card. is there some internal sound levels that can be altered? dip settings etc?
* Here's how I Fixed it*
I swapped the op amps over (3 x 8 pin surface mount JRC 4556 A519 IC's), IC5 to IC7
these could be replaced but I didn't have any spare new ones and its unlikely I'll be using this in surround sound mode so I swapped the two tiny chips over as per the arrows in the pic They are very small and fiddly so dont try this if its your first time soldering
