It doesn't seem to have any built-in memory, but it comes pre-loaded with a 16gb microsd (and a few sample songs on there). I haven't tried a 128gb card yet, but it is confirmed to be supported in their documentation.
This is odd and disappointing. I was expecting it to have 16Gb built-in memory, for reaching the stretch goal. Do you mean the 16Gb is just an included MicroSD card? Would this be a(nother) communication failure by Cyberdrive? Now I hope the Pro (X) memory upgrade to be indeed an "internal memory upgrade".
It sure as heck better be an internal memory upgrade on the Pro and Pro X. 64gig microsd cards are cheap as chips now. They better not bait and switch on that one.