I just got my 810 back from the repair guy with a new LR Baggs Anthem, plugged it in and it sounded crap, no gain, sounded flat, asked the repair guy and he said there was nothing wrong from his end, all installed according to instructions... Then I noticed that the 9v wasnt installed!!!! Well, with that onbooard and a little tweeking it sounds fantastic! Life Lesson, dont assume that tecah will install the 9v....