The problem is, tat the .mp4 you are importing to GarageBAnd is added as a movie track, and that is behaving differently from regular tracks. You cannot shift the position of the audio of a movie track.
*Macbook Air Garageband
*Garageband Site
*Apple Garageband Website
Oct 16, 2019 Import iOS songs or Music Memos in GarageBand on Mac. Open your song in GarageBand on Mac and then follow these steps to import iOS songs or Music Memos saved in iCloud. 1) Click File from the menu bar and put your cursor over iCloud. 2) Select either Import GarageBand for iOS or Import Music Memos File in the pop-out menu. Sep 02, 2019 To prevent accidental changes to a track in GarageBand, you can use the lock feature on Mac.Then when you’re ready to work on that specific track again, you can unlock it just as easily. While you can use this feature in GarageBand on Mac, it is not currently available, as of this writing, for GarageBand on iOS.So if you’re composing music on your Mac, here’s how to lock and unlock a track.
What you however can do is copying the the audio track of the movie to a new audio track. That will be unlocked. And then simply delete the movie you imported to Garageband.
Studio one 4 drum editor. To duplicate the audio region of the mp4 movie you imported, hold down the options key while you drag the locked audio region to a different audio track. GarageBand User Guide for iPad
You can merge (or bounce) any number of unmuted tracks in a song. This can be useful if you reach the maximum number of tracks for a song, but want to add more Touch Instruments.
When you merge tracks, the tracks are replaced with a single track containing a stereo audio file in a new copy of the song. The original song is available in the My Songs browser, so you can edit the original tracks.Macbook Air GaragebandMerge tracks
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Tap a track header to select it, tap the track header again, then tap Merge.
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In the track header area, tap the circles for the additional tracks you want to merge.
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Tap Merge.Garageband Site
A new copy of the song is created, with the merged tracks replaced by a single Audio Recorder track. The original song remains available in the My Songs browser.Apple Garageband Website
You can also merge one or more tracks with the FX track. Any effects recorded to the FX track are added to the new Audio Recorder track, and the FX track is turned off (so the effects are audible only on the new track). For information about using the FX track, see Remix a song with GarageBand for iPad.
