And up to 25 minutes STEREO.... That's three loops about eight minutes long. Sufficient for just about ANY song, I'd say...
And as for 'faking' it, c'mon, you're kidding me, aren't you?
You don't for one minute think your audience thinks you are playing everything NOW, do you?
I've been thinking a bit about some tricks you could do with this that go beyond what arrangers can do, at the moment... You could, for instance, lay down a bass and drums (and guitar, maybe) loop the first time, mute those on your arranger while the loop takes over, and then be able to add the ACC parts from ANY variation over the top of it, reassemble the style, if you will. Can't do that, now...
If you have multiple arrangers, and you can get them all to lock up, you could combine say the guitar parts of one arranger, with the drums and bass of another. Or if you have a WS or loop sampler, you could combine elements of it's loopy goodness with the more traditional elements from an arranger.
One of the things that drives me crazy is the gymnastics an arranger section goes through if you are in Pianostyle Mode and you start throwing a bunch of passing chords and altered harmonizations at it. Just make the first pass with straight ahead changes, go to the loop, and then jazz your little heart out... no more glitches!
I could record my guitarist's harmony on the first pass, and he could add a second harmony the next verse!
And of course, to get back to John's point... Every time I play my trombone, the audience already sees me stop playing the arranger. I have HAD to use SMF's since I moved on from my G1000. It will be nice to go back to arranger play, and as a bonus, now I can add the trombone part TO the loop if I wish. SWEET!
Right now, I don't see any confusion on the faces of any audience that I've seen watching a guitarist with one of these things, so why would our already confused audiences be any MORE so?!