There are two things to mention about using a USB sound card while your PC is still powered up.
first: As soon as you swap the USB port the PCM volume will jump to it's maximum.
second: The 'PNMixer 0.7.2' application will default to 'HDA Intel' ,if you done the 'first'.
How to fix this problem?
At the speaker symbol click on 'PNMixer Preferences' and select Device->Card: USB PnP Sound Device .
This will enable you again to change the volume of the sound card.
- PNMixer.png (5.51 KiB) Viewed 287 times
- PNMixer-USB.png (5.66 KiB) Viewed 286 times
Ref.: C-media CMI8738 PCI sound card
I looked around the web but there are no drivers available for Linux x86-64 therefore you will be limited to use it with 32-bit Puppy versions.