error writing /etc/modprobe.d/alsa-base.conf

[darky2003]

Hi,

I'm trying to install an usb audio device but when i follow this tutorial:
link text
(Alternate USB Audio Method)
i keep getting
error writing /etc/modprobe.d/alsa-base.conf
After i added these lines:
options snd_usb_audio index=0
options snd_bcm2835 index=1
options snd slots=snd-usb-audio,snd-bcm2835
And try to save.

[mitu]

@darky2003 Are you using sudo before running the editor ? It could be a permission problem, since a regular user is not able to write to that file. How are you editing the file ?

[darky2003]

**
hey mitu, finaly got it working!
But now i noticed the snes sounds are stille crackling,
Am i missing something?**

Followd this guide:
link text

Guide from link:

Ok, first delete the file /etc/modprobe.d/alsa-base.conf Raspbian Jessie does not use this config file like Wheezy did.

To find what address your device uses you need to first enter the command aplay -l this shows all audio output devices, and their address. For example, my USB sound card comes up as device 1 in the output which looks like this.

card 0: 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: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
Now, to set the device to your default card you will need to edit the file /usr/share/alsa/alsa.conf with the command sudo nano /usr/share/alsa/alsa.conf scroll down until you find the lines

defaults.ctl.card 0
defaults.pcm.card 0
and change them to (if your device is also listed as device 1, if not change the 1 to whatever address it was listed at)

defaults.ctl.card 1
defaults.pcm.card 1
Explanation: USB sound cards are registered as card 1 on Raspbian Jessie. On Wheezy they would be registered as card -2 by default and editing /etc/modprobe.d/alsa-base.conf would change that.

I do not know if this next step is necessary but without it my card wouldn't work.

Create and edit the file ~/.asoundrc by using the command sudo nano ~/.asoundrc and change it so that it only reads this:

pcm.!default {
type hw
card 1
}

ctl.!default {
type hw
card 1
}
Now your default audio out (speakers) and audio in (mic) are your usb device.