为简单起见，所有通知都是以音量级别100输出的。
All notes are printed at a volume level of 100 for simplicity's sake.
这将清除仍在处理的所有剩余通知，即使它们已经减弱为听不见的音量级别。
This will clear any residual notes that are still processing, even if they have faded to an inaudible volume level.
根据其他系统元素修改音量级别会是添加信息的直观方法，而无需添加通知或和声变化。
Modifying the volume level according to other system factors could be an intuitive way to add information without adding notes or harmonial changes.
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