Add USB audio devices.
Add a USB
microphone and speakers.
How to Add USB Audio Devices
Identify your system's primary audio device.
Identify which audio device is
your primary audio device.
How to Identify Your System's Primary Audio Device
Change the primary USB audio device.
You might want to
make one audio device the primary audio device if you remove or change
your USB audio devices.
How to Change the Primary USB Audio Device
Remove unused USB device links.
If you remove a USB
audio device while the system is powered off, the /dev/audio device might
be pointing to a /dev/sound/* device that doesn't exist.
How to Remove Unused USB Device Links
Solve USB audio problems.
section if no sound comes from the USB speakers.
Troubleshooting USB Audio Device Problems