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I've been testing with a USB recording interface (Singstar PlayStation 2 :) ) that only works at 44100. I've forced PW to 48000. I've tested both in normal PW and in the Ubuntu Studio Pro Audio implementation.

Everything works perfectly.

I think (again I could be wrong) that it's a compatibility problem between the keyboard and ALSA at the driver level.

Manufacturers are very much their own and don't always follow the standards. If there's a way to install the native hardware drivers it could solve the problem. But I don't know how to do it.