The Smurfs

This pack was primarily made using
NEZplug Version 0.9.4.8 + 2 + 19.20 VGM mod.

Tracks 18 ("Smurf Rescued") and 21 ("Time Out")
were ripped with MAME 0.236 VGM mod
because they're not present in the GBS file.
-The789Guy


Stereo tracks ripped with MAME 0.244 VGM mod 
(mame0244-10-g01826fc4902-dirty).
-marklincadet


Hacking notes:
- Songs are played by writing the address of
  their "load" routine to D95Ah/5Bh.
  The sound driver has a jump table at 4000h
  (CPU address, ROM offset 18000h) with common
  routines, which the game uses most of the
  time.
  Songs can be triggered using the MAME
  debugger with:
    w@0xD95A = 0x4000+3*id
  where "id" is a number from 0 to 0x1A.
  Songs begin at number 8.
  Values 0 to 7 are control commands
  (stop/pause/resume/fade/...)
- Two songs are *not* in the table and the game
  loads them by writing their direct address
  to D95Ah/5Bh.
  These are:
    7DF3h - Smurf Rescued
    7ECDh - Time Out
- SFX are played by writing the ID to D942h.
    b@D942 = id
  Valid IDs are 1 to 0x1E.
-Valley Bell

— marklincadet The789Guy

Source: VGMRips