edit8 AudioSync Pro

Edit8 Audio Sync Pro for iMovie-PP-FCPX helps in most editing workflows. It is based on the award-winning Woowave Sync Engine, which analyzes the sound of your clips and matches them perfectly.

This version is extremely simple to use, so it can be used by professional and amateur editors alike. You simply select a video file and a separately recorded audio track (HQ), click 'synchronize', and the app automatically creates a new identical clip with HQ audio.