Sorry for just now getting back with you. It’s been a crazy week with a lot going on.
I did forget about mentioning this in the new manual. I have a running list of changes we need to make to it. Thanks for letting us know about this.
The midi ground lift socket gives you the oppotuinity to disconnect the pedal from the ground path of whatever midi controller you are using. This may be useful if you are experiencing ground loops, which can cause a lot of noise. In some cercunstances it may more quiet to lift the ground, in others it may be more quiet to connect the ground…you have the option with this jumper. By default i’d leave it un-connected (jumper off) unless you are experiencing a lot of noise when the midi controller is used.
I hope this helps.
-Brach