+1000. Just tear it up, experiment with different playing dynamics with different settings with the envelope opening and closing, etc.. I have the Digitech and just got an old DOD FX25 in the mail and man I'm having a blast just finding out what these pedals can do with differences in my technique. Envelope filters are one of the most player-sensitive effects, you can get a lot of different responses with different approaches in your fingertips. Play with different range and sensitivity settings, there's always a sweet spot where the envelope operates quickly with a lot of "swoosh" directly following if you set these two controls at appropriate places. Envelope is actually my favorite effect, come to think of it, guess that's why I have two stomp box envelopes and 3 in my multi-effect.
