Adding multiple Loopback Alsa devices in ubuntu -

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i need create virtual loopback alsa sinks in ubuntu setup. can create 1 adding following /etc/modprobe.d/sound.conf

alias snd-card-0 snd-aloop options snd-aloop index=21 pcm_substreams=8

i need create multiple of these can't seem find documentation on how distinguish between virtual cards. create 20.

this creates 5 loopback cards:

options snd-aloop enable=1,1,1,1,1 index=10,11,12,13,14

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