Pick a song with keys notation (sloppak-spec §5.3) and choose Keys Highway 3D from the viz picker (Auto selects it for notation charts). The plugin auto-attaches to your MIDI keyboard; device, channel and transpose are configured from the player for now — this panel holds the graphics controls.
Soft light-bleed around the hit line, hit flames and consumed sustains. Applies live; turn off to reclaim GPU headroom on weak machines.