snes9xgit/snes9x — comment on commit 8db1c467ac7ada2d27584da1b72d9efcd5458f4c
File:  line 0
By twinaphex:

Another possibility is that due to the 'inaccuracies' in SNES9x - sound was playing there that shouldn't have been played on real hardware - but I would find that to be odd.

Anyway, I have a PAL SNES here with a PAL cart of Donkey Kong Country 2 I could be testing this with later today. There could be discrepancies in ROM versions though so I dunno - perhaps that sound was added to certain revisions of the game or subsequently removed - it's hard to tell - all I know is that SNES9x used to make a sound there - now it's gone.