The volume keys don't work as supposed when Shairport4w is open
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frankfriemel
When you have the program open, the volume steps of the volume keys on the keyboards ascend to 4 steps by push, and the mute key don't work because when you push it, the PC reacts two times (just like when you push two times quickly the mute key), and the sound card keeps with sound.
When I close the program in the task manager, the problem is solved.