Want to put in a battery that is disengaged when 9v jack is plugged in. Do I just need a switched 9v jack or do I still need a switched 1/4" OUT jack for when the unit is not in use and unplugged from 9v jack?
Use a switched 9V jack, which will disengage the battery if power is plugged in. I'd also use a stereo jack for the input jack, which allows the battery to be disengaged if there's no cable plugged into the pedal.