matrix (CMD 0x01) · click to paint, auto-sends
segments (CMD 0x05) · click any segment to toggle · auto-sends raw bytes
0x000x000x000x00
joystick input (HID)
waiting — press any button on the pedal
rows = pedal pages · left half = base layer, right half = shift (page held) ·
lit = currently held · page-tap advances, hold+press = shift button (no page advance)