Plan Pad

N labelled points on a scaled top-down plane: a source and microphones in a room, speakers round a listener. The plane keeps the caller's width × depth aspect, each point is bound to two values with optional height (on an elevation strip) and heading (a polar glyph with a rotate handle), and values are clamped to per-point limits and snapped to the axis step. Pointer capture, grab without a jump, nearest-point picking for near misses; every point, handle and elevation marker is a keyboard slider on the XY pad's coarse/fine convention. Edits arrive as per-field patches bracketed by one end per gesture, which planPadParamHandlers binds to parameter paths for a module face. Underlay and overlay slots draw in world units for walls, image sources or anything else.