I just tried plugging in my mandolin to my new venue. All i have done is plug it in with the 1spot power cord and put in a battery, plugged in my 1/4" instrument cable and turn on the tuner. The tuner is not being consistent nor has it shown me the right note I am trying to tune. It shows that i have a signal. Any ideas? I would send it back, but i want to use it for tomorrows show....which i will probably do and use my snark to tune with. Thanks in advance for any useful help.