There are lots of classic and huge pedals for fuzz and wah, sometimes including swell. Watching Youtube videos too much (as usual), I recently came across a great fuzz/swell sound. (Check out Doyle Bramhall II and his Premier Guitar rig rundown; pedalboard part starts around 12:30! https://youtu.be/M_N1wAt3TMA) Of course, that inspired a Google search mission but I found nothing with reasonable price or size, or modern for that matter. Potentially an open niche in the plethora of effects pedals out there, and an opportunity to make amazing fuzz sounds available at the feet of guitarists (for less than $600 or $5000 - prices mentioned for fuzz/swell pedals from Prescription Electronics Experience and the Zonk Machine, respectively.