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

Are you sure that sound was ever there? I tested with Snes9x 1.53, bsnes performance, and bsnes compatibility, and none of them played it. It seems more likely to be channel clipping in the DSP than envelope clipping.