This is simple, sensible and sounds good. The footswitch toggles between wah mode and volume mode, and in either mode it's off with the expression pedal maxed. It's a larger unit, but that keeps it from moving around and means it feels good to use.

Model: Morley Pro Series Wah Volume PWV
Made: USA, 90s era model (serial 49333)
Type: wah/volume (switchable)
Power: standard 9v supply or battery
Switching: buffered bypass
Equivalent new street price (approx): n/a
Mods: none
Accessories: no box or manual
Condition notes: used, a few minor marks, fully functional. Overall: good condition