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@saner 在 请教 R818 蓝牙 a2dp-source 声音不能调大问题 中说：
但是连接大众汽车中控多媒体的蓝牙媒体后，播放wav文件，汽车中控多媒体只能调小声音，不能调大声音。
你是在sink端调节音量吗？