Guitar Warm-up - Short Exercises to Start Your Guitar Practice. Online Tuner. How to Use the Tuner When you first load the tuner page, your browser should tell you that the applet is signed by Seventh String Limited and that the signature has been verified by a trusted source (Thawte in fact). You will need to click the "Run" or "Ok" or "Trust" button to allow the tuner to run. See "Security Issues" below if you want to know why this is necessary. You need to get the signal from your instrument into the computer of course. You can plug an electric instrument directly into your computer.
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