Ah, just so you know (this is gonna come out sooner or later given the format is so widely used) CD/XA files need some work to play in VGMStream.
Simply copying them from ISO/CD won't work, you need to use a program that will keep the RIFF header intact (CDMage does that for instance).
And then you need to rip the XA files with ADPCM Player (available here: http://www.freewebs.com/snakemeat/tools.htm
), since most of CD/XA files are containers that interleave few streams together.
Kinda convoluted (and Windows only, though I'm pretty sure both tools run under Wine), but Xevious 3D/G+ arranges more than make up for it.