USB speakers too loud

Recently got the Logitech S150 USB speakers for my laptop (Windows 7 - 64bit). They work great but are way too loud. Same issue with a headset/mic combo connected to a USB sound adapter. Googling for "usb headset too loud" came up with many others experiencing the same earsplitting issue.

I did find a solution for the speakers in this post by mgoblue62 in a Logitech forum thread and the response from SamuelBMorse:

1. Go to the volume mixer
2. Set the USB speaker volume to 70%
3. Set the volume of your application to a comfortable level

It didn't seem to work as well on my USB headset, at least not with Windows Media Player. May have to go back to using the KOSS volume control for that.