I have a project with acoustic guitar, double bass, midi piano and vocals. Perfect, but the tempo is too slow. It has to be speeded up 10 to 15 bpm. My question is what is the best moment to time stretch:
- Before mixdown, increase the song tempo and apply time stretching to all audio tracks individually
- After mixdown, apply time stretching to the stereo master
My intuition says before mixdown: time stretching is applied to less complex audio material and the sound of the midi piano is unaffected.