Hi, it's me again.
I noticed that the vertical scroll introduces a "ghost line." I thought I was doing something wrong, but then I tried one of the examples from your tool and the same thing happens, and I can't delete it.

Hi, sorry for bothering you so much, but this time I just can't figure it out. I'm the one who's stuck and can't see the error or what's happening. Why does the sound from the second routine always play in both routines? All the instructions execute correctly except the sound.
One other thing I'd just like to point out. Sometimes I set the backgrounds with a numeric variable instead of a name. On different occasions, the first background is number 0, and on other occasions, the first background is number 3.
Thanks.

It just doesn't seem to work. I think I've tried every possible combination. Thanks for the reply, though. Another thing, I saw this, and I think that once my passion for VCS Game Maker has passed (although it's unlikely I'll ever pass), I'll switch to this one too.
https://haroldo-ok.itch.io/blocklyvn8bit
In this third game, which I made with VCS Game Maker, I finally managed to implement the final GAME OVER screen. Piece by piece, I'm laying the foundation for a better game https://marc-vittorini.itch.io/take-the-lost-box