Can I do it? If so how?

I've selected the sound cars as my UX1, but no sound is playing through it.
I'm not sure but just go into soundsettings and put in your interface in every row possible?!
Schecter C1 Classic
Fender Vintage -57 Ri Stratocaster
Fender Blues JR w/ 12"Cannabis Rex
Mad Professor Sky Blue OD
Wampler Ego Compressor
TC Electronics Stereo Chorus/Flanger