The VE-GSPro Voice Expansion Board expands the MC-80 MicroComposer and A-90 or A-70 MIDI Controllers with 1,117 high-quality GS sounds and powerful effects processing on a single, user- installable board. These sounds cover a wide musical spectrum, ranging from lush stereo grand piano samples to screaming techno synths-placing the VE-GSPro among Roland's most comprehensive and flexible sound expansions. Features: Adds 1,117 professional -quality GS sounds to MC-80, A-90/70 Full 64-voice polyphony and 32-part multitimbral operation 128 Preset Patches ranging from techno synths to classical instruments 8 types of reverb and chorus, 10 types of delay, 64 Multi-EFX 2-band EQ 42 rhythm sets User- installable