The most musical amd natural sounding envelope filter I've ever used or owned, and the one I will now be sticking with, is the Xotic Robotalk 2. Hardly gets a mention but IMHO it's the best there is...
It is up only, but personally that has never been a thing for me. My first EF was a Boss t-wah which did go either way, but guess what, I only ever set it to 'up'.
The dip switches control filter voicing and sensitivity range for active/passive.