I want to share me experience for I find this thread misleading especially this statement:
Finished testing more games and there's no doubt, all output on Sound Blaster Pro 2 is reversed - digital, FM and CD audio.
This is absolutely 100% False, his cables were reversed to begin with.... please read on.
All the SBPro model are NOT reversed, this includes CT1330 and CT1600.
FM/OPL3 plays correctly and can be easily tested with Adlib Tracker 2 where you can actually select Left and Right part of the OPL3 individually and hear yourself.
Line-In is correct, CD is correct, and PCM is also correct.
Doom FM/OPL3 stereo mode is reversed in comparison to the MIDI music, but it does NOT mean the FM output is reversed on the SBPro1/2, its only Doom.
Correct behavior of the SBPro1 CT1330 and SBPro CT1600:
Duke3D, Blood setup the sound will not be reversed when SBPro is selected and the reverse switch should not be enabled.
Descent setup the SBPro WILL be reversed so the reverse switch should be enabled.
Doom, Heretic, Hexen PCM sounds correct when using a SBPro1/2, Doom FM will sound reversed on both (and SB16 for that matter) compared to the MIDI tracks.
The reversal of FM in comparison to its MIDI in Doom is no basis whatsoever to assume that the SBPro has reversed stereo.
If you find this thread on google please disregard JayCeeBee64 posts he probably had his stereo cable reversed or a RCA Red/White cable defect where the colors are reversed.
Please read that thread for correct SBPro1/2 stereo behavior: SBPro1 CT1330A, lets solve the Reversed Stereo myth!