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If you have two or more sound cards in your computer you can setup system wide or just for single user
List the sound cards
cat /proc/asound/cards
The output it will be something like this
0 [Generic_1 ]: HDA-Intel - HD-Audio Generic
HD-Audio Generic at 0xfcac8000 irq 91
1 [Generic ]: HDA-Intel - HD-Audio Generic
HD-Audio Generic at 0xfcac0000 irq 92
2 [Device ]: USB-Audio - USB Audio Device
C-Media Electronics Inc. USB Audio Device at usb-0000:06:00.4-3, full speed
3 [Device_1 ]: USB-Audio - Plugable USB Audio Device
Plugable Plugable USB Audio Device at usb-0000:06:00.3-2, full speed
Create a new config file
System wide
sudo vim /etc/asound.conf
Single user
vim ~/.asoundrc
Inside add the following, in this case i will change my default card to Device_1 (#3)
defaults.pcm.card 3 defaults.ctl.card 3
For a system wide you need to reboot your machine, single user should work right away
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