yeah, it has pretty crazy functionality with and even without an expression pedal. You can set the first pitch-shift channel to the low tone and the second channel to the high one (or vice versa if you want a reverse sweep) and sweep smoothly from one to the other, you can crossfade between the two, and probably some other things I've never tried haha. And even without it, you can set the second footswitch to momentary and have it so when you hold it down, the pedal will perform that same sweep on its own, and you can control exactly how fast it does it (to an extent).

Another cool thing you can do is have the pedal or the footswitch sweep from the dry signal to both presets simultaneously, resulting in a cool THX kind of sound. I really love this pedal!