Enabling C-media audio adapter on Raspberry Pi

Enabling C-media audio adapter on Raspberry Pi
2020-07
A while ago, I took one of those really cheap C-media usb audio adapter and to make it work, I had to do the following on Raspbian.

Add the following lines (this line will load a linux kernel module called 'snd_usb_audio' that will enable kernel to auto-load audio device drivers over usb ports).
```
netto@bella:~$ sudo nano /etc/modules
# c-media headset
snd_usb_audio
```
After this configuration, C-media adapters should be recognised on your raspbian (and, of course, you can always modprobe the driver).
Now, we need to set the C-media driver as the primary audio device on ALSA, otherwise, the input/output will always flow through raspberry pi built-in hardware.

Add the following line to force ALSA to set C-media driver as the primary audio device.
```
netto@bella:~$ sudo nano /etc/modprobe.d/alsa-base.conf
options snd-usb-audio index=0
```
Finally, a reboot is required.

References:
[Alsa-user] Set fragment size for USB sound card
C Media usb sound card with Ubuntu 13.04 on a Beaglebone Black
C Media USB2.0 Full Speed Audio
Linux Questions - C Media USB sound card not working with ALSA
Viva o Linux - USB AUDIO CONTROLLER ADAPTER NO LINUX (brazilian portuguese)

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Enabling C-media audio adapter on Raspberry Pi

2020-07