Little Scale has released a collection of free sound kits for LSDJ, Little Sound DJ for the Game Boy.
They are free downloads from his site.
Here are demo videos for each collection:
Atari 2600 Kit for LSDJ
http://www.youtube.com/watch?v=zp1nCZKHkEI
Debussy LSDJ Action
Sega Mega Drive Kit for LSDJ
Donk Kit for the WAV Channel in LSDJ