To redistribute your reflector content to icecast, you'll need to set up loopback sound interfaces.

The following file will be used to create 3 loopback interfaces at boot time.

It shall be placed in /etc/modprobe.d/:

aloop.conf

options snd-aloop enable=1,1,1 index=10,11,12

Then run the following command:

echo "snd-aloop" >> /etc/modules

The code above takes care of boot time configuration. To add the interfaces without rebooting, run the following:

(lsmod | grep snd_aloop) && modprobe -r snd_aloop
modprobe snd-aloop enable=1,1,1 index=10,11,12

You need to adjust the enable and index parameters to insert additional interfaces.