The Ketron SD1000 contains 512 high-quality sound patches, 47 drum sets, and 248 drum loops. It is also a fully compatible sound upgrade for use with programs using General MIDI (GM) protocols. It's ready to use with pre-programmed user kits - no programming required! We picked our favorite 128 sounds and pre-programmed them into the malletKAT's user setups. In these user kits, we loaded in the vibraphone and marimba sounds as well as the orchestral timpani, bells, chimes, xylophone, orchestral percussion, ethnic percussion drum sets as well as keyboards, basses, orchestral instruments, vocals, synth sounds and more. These sounds will keep you busy for quite some time. But if you want hear more, you can go through the instrument list of 512 sounds and create your own user kits.