Thank you for the constructive feedback! This was my first time ever making music and it took me a really long time just to make the short loop that's in the game. I wish I could have gave the sound more attention in general, but I had to move on and finish the rest of the game...
You're not the first person to be confused about level 7, the solution is to get the displays to read 1, 2, 3, 4.