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I am trying to setup Jasper on my RPi 2 B by following these instructions http://jasperproject.github.io/documentation/installation/#configure-raspbian and just figured out that there's no /etc/modprobe.d/alsa-base.conf for me.
I can successfully record sound by specifying USB mic but not sure how to make it default for the system without editing alsa-base.conf.
Ok, first delete the file /etc/modprobe.d/alsa-base.conf Raspbian Jessie does not use this config file like Wheezy did.
Now, to set the USB sound card 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
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.
