Sound output changes apparantly at random

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http://crunchbang.org – So went to numbers in asound.confdavid@crunchbang:~$ cat /etc/asound.confpcm.!default {type hwcard 2device 3}ctl.!default {type hwcard 2device 3}Got sound in monitor.Then yesterday sound in headphone. Grrrr. checked card numbers and they had changed, so consistent with sound.Booted up today and card 2, dev 3 is back and sound is in the monitor. Where do these card and device numbers come from? (HowTos)