While I must say having the emulator built in is awesome, it seems to play certain instruments a lot differently than a real SoundBlaster (and even DOSBOX) does. I know there are differences in general between emulation and real hardware (and even between two copies of the same sound card) but this is pretty blatant
I think it has something to do with the fact that games were able to modify timbres of instruments for Adlib, maybe this functionality isn't being supported?
Here's a comparison for the most obvious example (GMMARS/debrief screen):
Soundblaster recordingDOSBOX recordingOpenXcom recordingThe bass/guitar sample in particular is a lot softer and smoother in the SoundBlaster version, and overall the SoundBlaster/DOSBOX version is a lot more pleasant to hear. Other songs really aren't that bad, but this track in particular is way different.