Udevl and Pulse

You need to become root:

# devel-su
 #echo 'ATTRS{id}=="mtsndcard", ENV{PULSE_IGNORE}="1"' > /etc/udev/rules.d/89-pulseaudio-usb.rules
 cd /etc/pulse/xpolicy.conf.d
 mv usbaudio.conf.disabled usbaudio.conf
 pactl load-module module-udev-detect