Hi g8chk,
- Get access to the console and execute:
alsamixer
- Select your USB DAC (F6)
- Adapt the volume
- quit the application (CTRL-C)
Frank
- Get access to the console:
Use SSH from your PC
- If you are not familiar with SSH read this for Windows or this for Linux/MacOS
The default login for RuneAudio is "root" with the password "rune" (without quotes).