Each relay can respond to 2 separate notes and velocities
The Devantech Midi Controlled 8 Channel Relay Module (4 Dimmer) provides 8 relay outputs that respond to midi note or control change messages, these can be either mechanical or solid-state relays. This small module is powered by a single 9 V AC or 12 V DC supply. (Using dimmers requires a 9 VAC supply).
Each relay can respond to 2 separate notes and velocities. Each relay can respond to a single MIDI control change message, turning on over a threshold value and off under it. Solid State Relays for phase-controlled Dimming, 48 VAC - 250 VAC at 5 Amp (100 mA min load).