Trying to ferret out the last instances of quarter-note being used instead of eighth-note.
The comments in `audio.inc` are now confusing, but I don't know how to fix them...
BF_SNDVOL .EQU BF_SND + 1 ; REQUEST SOUND VOL - L CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
BF_SNDPRD .EQU BF_SND + 2 ; REQUEST SOUND PERIOD - HL CONTAINS DRIVER SPECIFIC VALUE
BF_SNDNOTE .EQU BF_SND + 3 ; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS QUARTER NOTE
BF_SNDNOTE .EQU BF_SND + 3 ; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS AN EIGHTH NOTE
BF_SNDVOL .EQU BF_SND + 1 ; REQUEST SOUND VOL - L CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
BF_SNDPRD .EQU BF_SND + 2 ; REQUEST SOUND PERIOD - HL CONTAINS DRIVER SPECIFIC VALUE
BF_SNDNOTE .EQU BF_SND + 3 ; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS QUARTER NOTE
BF_SNDNOTE .EQU BF_SND + 3 ; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS AN EIGHTH NOTE