It would be a great feature for the GxWah to have an automatic fade in of the effect when the expression pedal when the expression pedal is in use and an automatic fade out if no motion of the expression pedal is detected. Perfect would be options to set parameters for fade in / fade out time (e.g. values from 0.01 to 1 second) and sensitivity for activation of the fade in/out (e.g. MIDI CC values from 1 to 10). The time how long the effect will be activated after an fade in event should also be adjustable.
This would simplify and speed up the switch on/off process of the wah effect... as most Morley wah pedals are equipped with such an option.
You don't have to switch a separate button to (de)activate the effect, just start moving the expression pedal and the wah effect is in the signal chain. If the pedal is not moved the signal is unaffected.
This feature should not be confused with an auto- or touch-wah