My purpose is to know how DS produces Gameboy sound, if this machine is reliable for compose music with orriginal Gameboy feeling.
All Gameboy models handle sound differently (especialy channel 3). I need to know if the orriginal tone generator circuitery in the Gameboy is the same as one present (or not) in DS.
Unless you're into chip tunes (in which case, almost every Game Boy model produces slightly different quality sound)
That appears to be exactly Dr.Wily's concern.