I am the happy new owner of Kev's Trondheim overdrive pedal, and very lovely it is too!
Top bloke to deal with, the pedal was just as described and arrived the next day.
Think of the neck pickup volume as your master volume, and the bridge pickup volume as the "hollow twang" knob and you'll be ok leaving it turned down.
Under no circumstances should the "hollow twang" knob be turned up on its own 😆