1. Spaced to fit standard piano keyboard spacing
2. Multiple triggers out - I/O line trigger out per sensor, 12V.
3. Works with FX51d or can detect key triggers by itself
4. Key press detection (Solid state - No actual key presses unless you define a key)
5. Connected to BAC allows for more advanced controls
6. An eloquent solid state way to accomplish sensing closer than our Fx51D
7. Small knob rotation detection.