In the text games you seem to be able to press F6 and it cycles through 10 volume settings for the music.
It goes louder, then when it gets to its loudest volume it plays a sound, then when you press it again it goes to the quietest volume.
Alternatively you can open your volume mixer by finding the speakers icon in your system tray, right clicking, then choosing open volume mixer.
Press tab until you get to volume for play.exe, then press down to lower its volume until it is at a comfortable level.
~ Ian Reed
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