Identical USB cards to fixed card numbers

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Hi all,

I'm trying to assign identical USB cards (3 x M-Audio Mobile Pre) to fixed card numbers, based on their USB port. So far, I've created a udev rule that maps the kernel and device name to /dev/dsp[cardnumber]. 

I know that this rule is working, as changes are reflected in the /dev/dsp* namings. For instance, using card numbers 11,12,13 instead of 1,2,3.

The problem is that alsa completely ignores these rules. 

Any hints ? What is the link between the dsp* and alsa card numbers ? Is udev supposed to run first, then alsa supposed to name its cards from... where exactly ? How can I verify this is happening ?

Is there an alternative approach to achieve fixed card number assignment from usb port id ?

Thanks in advance,
Diego

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