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The Novation Speedio is nominally non supported. However, iif it is USB Audio/MIDI class compliant it should work with the standard snd-usb-audio ALSA module. You probably can check that out, as the MIDI interfaces should show up and work alright.

However there probably should be issues with the audio interfaces, like crackling noisy and/or robotized sound ? If thats the case, you can try tweaking settings over the jackd parameters for the alsa driver: try with buffer sizes greater than 128 and with periods no less than 3. Sticking with the nominal 48000 sample rate may help. But these are just shots in the dark.

If that doesn't get things to sound right your audio device is definitively unsupported and will need the vendor (Novation) to agree and open up the technical/proprietary specs and let some smart ALSA developer be ready for the challenge :) Unless someone is brave enough and have plenty of time to do some reverse-engineering over the USB traffic on XP or OSX. Given the business (ie. lack of time) of all those great LADs I don't see that happening anytime soon. Without the manufacturer help most probably it won't happen ever.

Cheers,
rncbc aka Rui Nuno Capela