Things You'll Need:
- GarageBand software
- Computer
- Instrument
- Instrument cable
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Step 1
Connect your instrument to your computer using an instrument cable (or microphone cable, if the instrument is miked).
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Step 2
Select a real instrument track in the recording field so you can hear your instrument in the monitors or on headphones.
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Step 3
Select "Control" in the GarageBand menu. Then select "Show Tuner" in LCD from the drop-down menu. Alternately, press "Command-F" to make the tuner appear.
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Step 4
Play your instrument to illuminate the tuner on the screen. A pitch will light up, with sharp and flat displays indicating whether your instrument is in tune.










