How do you autotune on garageband 2006?

To autotune in GarageBand 2006, first, record your vocal track. Then, add an "Audio Unit" effect by clicking on the track's "Edit" button and selecting "Audio Units" from the effects menu. Choose an appropriate pitch correction plugin, like Apple's "Pitch Correction," and adjust the settings to achieve the desired level of tuning. Finally, tweak the parameters to fine-tune the effect and ensure a natural sound.