Need tutorial concerning old A4 example

Hello, it was old example how to use A4 from MrDataline https://m.youtube.com/watch?time_continue=40&v=Mm0WuPltadM&feature=emb_title . Some users wanted to share step-by-step tutorial about that video. Do you know- is it available somewhere ? Or may be advice some other good step-by-step tutorial - how to make music like that from scratch? Thank you.

a quick search on the forum gives back few tutorials you can have a look at, not sure this is what you’re asking for though:

Thanks!