Daughterboard Bugs
A large number of Sound Blaster 16 cards have a flawed digital sound processor on board that causes various issues with MIDI daughtercards attached to the Wave Blaster header. The problems include stuck notes, incorrect notes, and various other flaws in MIDI playback. The particular Sound Blaster 16 cards that are affected carry DSP versions 4.11, 4.12 and some 4.13. Older DSP versions such as 4.05 do not suffer from this bug. There is no workaround for this flaw and it occurs with all operating systems since it is an issue at the hardware level. The DSP version can be checked by running the "DIAGNOSE" utility in DOS or looking at the DSP chip on the sound card. A version number is printed on the CT1740A chip usually near the CT1745A mixer chip.
Read more about this topic: Sound Blaster 16
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