First post, by aitotat
GUS ACE rev 1.0 has reversed stereo. The GUS sound channels are swapped but the Sound Blaster connected to the GUS ACE line in functions normally. But if you connect GUS ACE to speakers with reversed cable, then Sound Blaster channels are reversed and you need another reversed cable to conned the SB to GUS line in.
So the stereo issue can be fixed with proper cables but it is also possible to fix the card. Note that GUS ACE rev 1.1 does not need the mod. It does not have reversed stereo issue and needs no fix.
I tried to make the instructions as easy as possible and here they are:
Here is the same picture in higher res.
Here is picture before cutting the traces.
And after soldering wires.
I also recapped the card. This is unrelated to the fix and was unnecessary since I cannot hear any difference. But the old black Nichicon caps are now replaced with new golden Nichicons.