Hey, I had MXR, Qtron, 3Leaf Wonderlove, EBS, even have Future Impact that I use but not for envelope... the best out there for me is Moog Mf-101.
Also I can suggest Iron Ether Xerograph Deluxe, great envelope. Plus both IE and Moog can also be used as low pass filter.
Just had a clinic with my buddy about pedals, and have to say Alembic is so good with pedals, even better then P passive basses.
here is pic from clinic