MIDI Player 可视化MIDI播放器 基于WEB 交互 左键 拖拽旋转视角 中键 拖拽平移视角 滚轮 缩放X轴 ctrl+滚轮 缩放Y轴 MIDI Player A visualized midi player Base on web Interaction left mouse button: drag to rotate camera middle mouse button: drag to shift camera scroll: scale X ctrl+scroll: scale Y