Rasputina? Not instrumental, though, and only one cellist (I think), but it is front and center.
I mean, the short answer is no, not really, there aren't any other bands that (a) consist entirely of cellists, and ( rock/rawk.
The more I think about this, the more I have to believe he's got to be kidding.
Please. Be kidding. (clasps hands together, gazes skywards...beatifically...)
The problem with I2S is that it's still transmitting the clock (as opposed to async, where you'll see [or infer, in the case of a 2-way protocol such as USB or firewire] a clock input on the transport), so if that clock is still jittery, then the signal will still be jittery. At least, that's my understanding. Colin or anyone else, please feel free to step in and correct me.
Lies. If you buy a dollar sandwich from McDonald's, do you really think you could turn around and sell it to someone else for a dollar? No, you'd have to give a discount, to compete with McDonald's.