I've owned the GT-6B and various pedal effects, but I'm looking for the convenience of filling the last space in my rack with a multi-effects unit (chorus, comp, drive, optional synth) that doesn't affect the signal in a bypass mode. Does anyone have any insight for new products coming out in the near future? Something like the Line 6 unit might be nice if it were only in a single space. I've heard some guys using the Boss VF-1 with decent results... can anyone here personally attest to this? Most of the 50+ reviews on harmony-central.com are not bass related.