My expression pedal would not work all the way on my M5. - I. e. 60% of the range.
Not the whole range.
I did som experiments and discoveres that this will work:
Tip to 1 st pin
Ground to Mid Pin
Ring til 3rd pin
Pin(s) is on the pot in the Expresseion Pedal.
It is normally:
Ground to 1 st pin
Tip to Mid Pin
Ring til 3rd pin
So I soddered a small cable-adaptor. Stereo Male Jack to Stereo Female Jack.
And switched the Ground and the Tip.
Voila !
Now my expression pedal works all the way on my M5 !
Best
Jan