The Roland SRX-01 Dynamic Drum Kits is a sound expansion board for Roland synthesizers and sound modules. It contains a collection of high-quality drum and percussion sounds, ranging from classic drum kits to modern sounds. It also includes a variety of sound effects and studio-quality sounds. The SRX-01 is compatible with a variety of Roland synthesizers and sound modules, including the JV-1080, JV-2080, JV-1010, and XP-50.