Please add a function to seamlessly switch between variants of the same song (different instruments, sound effects and their combinations) by clicking a button

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For example, you could click "Guitar" button and listen to tracks recorded using different pickups, but with guitar only. And when the "Band Mix" button is clicked, it would replace the guitar only track with the track that is guitar plus band. The tracks would need to be linked so they could trade off at the same point in the song.