KORG GT-4 Owner's Manual

To calibrate your KORG GT-4, turn the calibration knob until the desired pitch is displayed. Standard tuning is A=440Hz.
Ensure that your instrument is properly connected to the input jack. Check the battery and replace it if necessary.
Press the mode button repeatedly until the desired tuning mode is displayed on the screen.
Yes, the GT-4 supports various alternate tunings. Use the mode button to select the appropriate tuning mode.
Use a soft, dry cloth to clean the surface. Avoid using solvents or abrasive cleaners. Store in a dry place.
The GT-4 uses a 9V battery. To replace it, open the battery compartment on the back and swap the old battery with a new one.
Yes, the GT-4 can be powered by an optional AC adapter. Make sure to use a compatible 9V adapter.
Check the connection to your instrument and ensure the input jack is secure. Interference or low battery power can also cause erratic readings.
Make sure you are in a quiet environment, and the instrument is properly connected. Pluck the string gently for the most accurate reading.
Check the battery level and replace it if necessary. Ensure the tuner is not exposed to direct sunlight, which can affect visibility.