I tried turning up the swell to 100% and didn't get the pad swell. I thought this swell nob was similar to the rise feature on the Strymon timeline but no luck. I think you have to also make sure the delay is 100% wet as well in order to truly get the volume pedal effect. The swell is only applied to the delay note. I'll try this tonight and report back as I also want an answer to this question 