I was told that the XR can be used as an FX unit for other modules? Any truth to that? The Roland site doesn't say anything about it being an independent MFX unit.
Somebody, in terms of processing external sounds the FS is a monster. You can put your mic/guitar though 7 effects at the same time (!) - input fx, mfx1/2/3, chrous, reverb and mastering. It's a bomb!