Ok, the expression pedal on the stomplab 2G is tiny, but it can do a lot.
It's actually pretty easy to play once you get the feel for it. I decided to demo all of the parameters you can assign to it so you can get a feel of the possibilities.
You can buy it here (if you buy something through this link I might earn a commission at no extra cost to you, it's how I support my channel): https://amzn.to/2SIxfNQ
Hope this helps!
In this video:
00:00 Setting parameters to the expression pedal
00:13 Volume/ Swell
00:59 Wah
01:42 Auto Wah
02:09 BRN Octave
03:02 U-Vibe
03:43 Tone
04:34 Ring Mod