xpansion Card?

The Roland SO-PCM1-03 Rock Drums Expansion Card is an expansion card for the Roland S-50/S-550/W-30 Samplers. It contains a collection of high-quality drum sounds for use in creating rock and pop music. The card includes sounds from classic drum machines such as the Roland TR-909 and TR-808, as well as samples of acoustic drums. The card also includes a variety of percussion instruments, including tambourines, shakers, and cowbells.