how much music are you planning on taping? at 16 bit, 2 gigs gets you about 3 hours, so 20 gigs should get you 30 hours of record time... are you really going to need more than that? and even if it's not enough, I'd guess it'd be easier to use your second JB3. with both of them together, you should be able to get ~60 hours of record time (assuming you have enough battery power to power the units that long anyway)...