Please see bug 31109, bug 46996, and bug 46998. There's no way
[currently] that we can dynamically assign these indices. Some people
want onboard to override external sound cards; some people want the
opposite.
Luckily there's a workaround that doesn't require you to know the
innards of asoundrc (although your approach suffices, too):
$ asoundconf set-default-card $CARD
will create an asoundrc for you (please see the output from ``asoundconf
list'').
** Changed in: alsa-driver (Ubuntu)
Status: Unconfirmed => Rejected
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alsa-base: USB sound card registers as card 1 (leaving _no_ card 0)
https://launchpad.net/bugs/65936
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