SBPro 2.0 Sound Card Clones Stereo Summary
Audician 32 YMF71x:
Stereo in Doom and Duke3D is correct without reverse switch.
Wavetable wiring is reversed.
FM L/R is Correct with Adlib Tracker 2.
AudioDrive ES1688F:
Stereo in Doom and Duke3D is correct without reverse switch.
Wavetable wiring is reversed like the YMF71x.
FM L/R is Correct with Adlib Tracker 2.
Aztech Pro 16 ABI (2316-s):
Stereo in Doom and Duke3D is correct without reverse switch.
Wavetable wiring is correct.
FM L/R is Correct with Adlib Tracker 2.
Aztech NX Pro:
Stereo in Doom and Duke3D is REVERSED.
FM L/R is REVERSED with Adlib Tracker 2.
*** This one is strange, it sometimes reversed sometimes not.
More info about the stereo reverse issue: SBPro1 CT1330A, lets solve the Reversed Stereo myth!
According to these articles the YMF71x and ES1688 have the wavetable header wired incorrectly.
http://www.epanorama.net/documents/pc/waveblaster.html
http://www.heise.de/ct/artikel/MIDImal-285418.html
https://en.wikipedia.org/wiki/Creative_Wave_Blaster
The only correct way is: Pin24=Left, Pin20=Right on the daughterboard and the sound card.
All the SBPro2.0 clones I've tested have the exact same PCM/Voice L/R audio channel configuration, nothing is reversed.
squareguy and firage confirm that Creative SBPro2.0 CT1600 exhibits the same channel behavior as the clones.