Expression pedal Option / physical volume knob

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With the announcement of the Xsonic TX which supports two expression pedals, I think this would be a great idea to integrate.

I tried to make this myself but can't my controller to run under platform.io (it does in arduinoIDE).

My idea was to hook a 100kOhms potentiometer to a GPIO port and assign the value of the pot to amp_vol.

So not a typical TRS/RTS pedal but hardwired like the buttons.

This would for example allow the use of a large foot-friendly knob to adjust volume during playing. My other idea was to use two more pots to define a minvol and maxvol parameter between which the volume can be adjusted, so it becomes more sensitive.