Well, it's an xtra created by motu for their audio cards (see motu.com).
I've got a 2408 which allows me 3 banks of 8 channels i/o each. Bank one
is analog i/o bank 2 to the da-88 and bank 3 is spdif (there are other
models).
now it seem that the xtra doesnt' route the audio at all but merely sets
the banks, clock and frequency for each device on the card (you can have 3
different devices on one card)...
so there's still no way to route the audio at all. Might be interesting to
get in touch with motu though.
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