Quantise the timing of audio regions in GarageBand on Mac

You can quantise, or automatically correct, the timing of regions on an audio track. This technique is especially useful when regions on the track contain the right notes but are not perfectly in time with the project tempo.

When you quantise the timing, selected regions on the selected track are adjusted to the selected note value. You can quantise the timing of regions with drums, single-note instruments and chordal or polyphonic instruments.

If the track contains imported audio files (orange) and you want to quantise the timing of the audio files, the Follow Tempo & Pitch tick box needs to be selected for each audio file.

Quantise the timing of selected audio regions

In the GarageBand on Mac Tracks area, select the audio regions you want to quantise. The regions need to be on the same audio track.
Make sure the Region tab is selected in the Audio Editor inspector.
Choose the note value to use as the basis for timing quantization from the Time Quantise pop-up menu.
Drag the Strength slider to the left to decrease the strength of quantisation.

Note: If no regions are selected, choosing a note value from the Time Quantise pop-up menu sets the value for auto-quantisation of recorded regions.

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GarageBand User Guide

Quantise the timing of audio regions in GarageBand on Mac

Quantise the timing of selected audio regions