Gotcha! I've been wanting to learn how to make dynamic transitions of music like this that depend on situations. If you know how to prepare soundtracks for this purpose so they can be actually worked into a game let me know.
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It definitely needs help from programmers. It is them to control when and how to play the tracks. I know very little about this part.
As for the soundtracks, just make sure the tracks have
- Same tempo
- Same melody
- Same duration
My experience is:
- Create a track first, do whatever we like at this point
- Make a duplication and change the instruments, the broken chords, and increase or decrease notes by octaves.
- Mixing and mastering.
In the last GMTK jam, I made one track with 5 variations so they could fit 6 different minigames. You can find the game and soundtracks here: https://basswastaken.itch.io/gamejam-2022-entry