names for sound devices

[peasthope@shaw.ca]

According to http://wiki.debian.org/ALSA .
peter@dalton:~$ cat /proc/asound/cards
 0 [SI7012         ]: ICH - SiS SI7012
                      SiS SI7012 with ALC655 at irq 18
 1 [default        ]: USB-Audio - C-Media USB Audio Device
                      C-Media USB Audio Device    at usb-0000:00:0a.0-3, full sp
eed
 2 [default_1      ]: USB-Audio - C-Media USB Headphone Set
                      C-Media USB Headphone Set   at usb-0000:00:03.2-1, full sp
eed

My best guess is that the names SI7012, default and default_1 
are assigned by udev; but how?  Nothing evident in /etc/alsa/rules.d 
nor in /lib/udev/rules.d .  Are there rules elsewhere?

Thanks,              ... Peter E.

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