Re: Ditto x4...
Can you control loop volume with an expression pedal?
Edit: I watched the demo the TC guy did at Sweetwater and was disappointed to see the guy double tapping to stop loops. That's what I hated about my RC-2 and it's also what I love about my Ditto X2. You can make a selection so that one tap of the bypass switch stops the loop, and a tap of the loop switch starts the loop over at the beginning.
I do like the idea of two loopers in one pedal and really like the MIDI sync, but I can pass on the other bells and whistles. I guess that fade out might be useful, but I dunno ... sometimes I think things too often get taken beyond the point of practicality.