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如题 两首BGM切换时如何让前一首渐弱消失，而后一首渐强进入呢？有大佬说写个事件让音乐渐强渐弱，但是在声音事件的动作列表里没找到相关的功能。
有个设置音量的动作，通过参数的递增、减做到音量的渐强、渐弱
