Failed to open maudio usb interface
My (admittedly old) Maudio Quattro usb1, compliant audio interface is working fine with my OS (Ubuntu 16.04): I can use it instead of built in sound. It also worked out of the box with LMMS, via ALSA.
However, when firing up Ardour (4.6), with ALSA, and selecting the Quattro for input and output device, I get the error: 'failed to open audio device.'
What am I missing, please?
(Or is it just a matter of getting a newer version of Ardour?)