Not aware of any, I'd make one myself but my bass and recording gear are elsewhere right now... I'll see if I can get anything remotely representative with a bass vi direct in.
EDIT:
Here's a recording of the Upper and a fuck and tafm to show how it stacks, Squier Bass VI to m-audio computer interface.
Doesn't exactly sound wonderful but I think it shows the cool way it keeps low end while also being bright and is very trashy and fun stacked. You get a lot more audible octave up on higher notes, I didn't really demo that, but that's pretty standard for any octave up!