Hey Y’all,
I got a simple M-Audio EXP and it worked very well after choosing the Assigns (heel-toe or stop).
For some strange reason, suddenly it stayed on when changing scenes.
When switching between presets, all control is lost.
It was the BYPASS-Assign which gets lost by preset-change.
WAH still reacts…
Ive found a workaround :
Go into a Factory Present
- take a wah into it and do the assigns as needed
- set parameter as defaults
- copy the device and paste in a preset you want
- save the preset
- if it wont work the first time, reset to defaults
- save preset again
- now the device should work everywhere
Maybe it works with other devices, too.
Research-Mode ON…. 
Let me know if it works you!
Good Luck!