First post, by aleksej
Looks like some (atleast two) wavetable daughterboards has versions with mirrored design - WB connector lie in opposite side of PCB that make it incompatible with soundcards/WB enclosures.
EMU8801 Sound Engine
Normal one
http://wavetable.web.fc2.com/emu.htm
Reversed
http://www.yjfy.com/museum/sound/EMU8801_sound_engine.htm
AVM General MIDI Engine
Normal one
http://wavetable.web.fc2.com/avm.htm
Reversed
http://electro-music.com/forum/topic-21634-100.html