Step 1: Select target region
Double-click the region you want to edit in the Timeline to view it in the waveform edit pane. Our example shows a vocal phrase.
Step 2: Adjust placement
In the Control menu, turn off the Snap to Grid function and adjust the position of the region until the first word of the phrase is on the correct beat.
Step 3: Point of no return
Position the cursor in the upper-half of the region in the edit pane and it transforms into the Flex pointer. Click on the first part of the waveform you want to edit.
Step 4: Flexitime
You’ll probably be asked to enable that track’s Follow Tempo & Pitch feature. Click Continue and GarageBand will analyse the audio in the project for you.
Step 5: Flex of gold
A flex marker should now appear. The areas around the marker change colour to indicate which parts of the waveform will be stretched or compressed.
Step 6: A nice example
Drag the marker left or right to adjust the position of the waveform. Here, we’re moving the third word in the phrase so that it falls on the second beat of the bar.
Step 7: Flex in effect
Use the pointer to insert additional markers to adjust the positioning of adjacent parts of the waveform, gradually shaping the phrase to fit the project tempo.
Step 8: Star performance
Select the track you want to align the timing of everything to, and click the star in the box that appears when you hover over the left-edge of a track’s header.
Step 9: Match of the day
Click Continue, then tick the checkboxes in the headers of the tracks that you want to align to the groove master and watch the waveforms snap into line.
Click the image below to zoom in and view the annotations.