# MATLAB: ALSA lib pcm Error

alsalinuxMATLABsound

I am having trouble playing sound with MATLAB R2015a on Linux/XUbuntu 15.04. When executing
load handel;sound(y,Fs);
for instance, the terminal throws the errors shown in the attachement. A colleague of mine is facing the same issues on an XUbuntu machine.
I use an external class complient USB sound interface (Lexicon Alpha) which is the system's default sound device.
What to do?