Use the Tuner on an audio track in Logic Pro for iPad
You can tune instruments connected to your iPad with the Tuner to ensure that audio recordings are in tune with any software instruments, samples, or existing recordings in your projects. You can use the Tuner to tune an instrument connected to the audio input for an audio track in your project.
In Logic Pro, tap the More button in the control bar, then tap Customize Control Bar.
Tap Modes, then tap the Tuner switch.
In Logic Pro, tap the track header of an audio track to select the track.
Tap the Tuner button in the control bar to show the Tuner.
Play a single note on the instrument and watch the Tuner. If the note is flat or sharp of the keynote, the note name and horizontal line in the Tuner appear red. The horizontal line points to the left if the note is flat, and to the right if it’s sharp.
Adjust the tuning of your instrument until the note name and horizontal line appear blue and the horizontal line is centered.