I have a USB sound card for my pi b+ which I want to setup as my default sound device and all the tutorials for setting up involve editing the alsa-base.conf file in /etc/modeprobe.d, but I don't seem to have that file! Anyone able to help? I can see the usb fine when i run lsusb, and alsamixer detects it and plays audio fine. I'm running raspbian Jessie.
This is the USB sound card I'm using: