X-Axis = Time, Y-Axis = Pitch. Loop range based on line endpoints. Autostarts playback.
Drag lines/endpoints. Scroll to Pan (X/Y). Ctrl+Scroll to Zoom.
Right-click or long-press near a line/intersection to remove it.
Draw: Drag. Move End: Drag Circle. Move Line: Drag Line. Delete: Right-Click/Long-Press.