How to force Rpi to use usb soundcard

Question

I have RPi with usb soundcard I have follow this answer USB card as my default Audio Device But i still can't make it work the settings always changing itself and i can't set my default soundcard to my usbsoundcard

there is no sound if I put my speaker to the usb soundcard but it have when I put it to default rapsberry 3.5mm jack out

I test it via aplay

my lsub

Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. 
Bus 001 Device 004: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller

my alsa-base.conf

# Keep snd-pcsp from beeing loaded as first soundcard
options snd-pcsp index=-2
# Keep snd-usb-audio from beeing loaded as first soundcard
options snd-usb-audio index=0
options snd_bcm2835 index=1
# Prevent abnormal drivers from grabbing index 0
options bt87x index=-2
options cx88_alsa index=-2
options snd-atiixp-modem index=-2
options snd-intel8x0m index=-2
options snd-via82xx-modem index=-2

aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 1: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

update It seems like my rpi won't produce sound if I remove my usb sound card when I remove my usb sound card I can't execute amixer/alsamixer it returns cannot open mixer: No such file or directory

Answer 1

The trick is is in ~/.asoundrc

If you have already gone into /etc/modprobe.d/alsa-base.conf and changed options snd-usb-audio index=-2 to options snd-usb-audio index=0 then:

First:

sudo nano ~/.asoundrc

Second:

Add

pcm.!default {
    type hw
    card 0
}

ctl.!default {
    type hw
    card 0
}

Then save and reboot your Pi.

This works because when you add options snd-usb-audio index=0 to /etc/modprobe.d/alsa-base.conf it only sets your usb card at index 0, it doesn't enable it.

Cheers!

Answer 2

so today i can make my rpi to use the usb soundcard the workaround is

Reinstall my rapsbian with noobs
uncomment one line in alsa-base.conf

# Keep snd-usb-audio from beeing loaded as first soundcard
# options snd-usb-audio index=-2

and never ever go to GUI/startx
(I'm not sure about this one but when i run startx the amixer settings is changing itself)

now the aplay and arecord working flawlessy

Answer 3

I have read idea about sound card. May be help u. Pi 2 Design is excited to introduce the first Tube Amp specifically designed for any of the 40-pin versions of the Raspberry Pi SBC Family. The 503HTA Hybrid Tube Amp HAT, designed and manufactured by Pi2Media (a division of PI 2 Design), is a High Quality I/O Shield designed to bring “Sweet Tube Sound” to the Raspberry PI ® family of Single Board Computers. This HAT allows the Raspberry Pi ® SBC to drive Headphones from 32 – 300 ohm with ease and fidelity.

Based on the popular Bravo V2 design with all recommended Mods, the On-Board PCM5102A DAC drives the single stage 12AU7 (or 6922) tube. The Class-A Output Stage is comprised of the IRL510 and LM317A. The dedicated heater supply insures zero crosstalk. Source: http://ubuntu4u.info