Frequently Asked Questions
How do I separate headphone and speaker audio volume settings in Windows 7
If you right-click on the ‘speaker’ icon in the taskbar, choose ‘playback devices’ you should see separate ‘devices’ for speakers and headphones, if headphones are plugged in. (Windows 10 here, but IIRC Win7 is similar.)

Double-click on ‘headphones’, then the ‘levels’ tab.

The setting here should be separate from the one for the speakers.
Double-click on ‘headphones’, then the ‘levels’ tab.
The setting here should be separate from the one for the speakers.