Hello, i had some problems with the musicbox at Chapter 5 in King's quest, so i did a quick guide to check it out. if you have the same person and the same color here as the titlepicture is, then you have to set these at the music box:

Pink, Pink,.... at the start and not red, red!!!

i know it's not much, but it should help you earlier as i find it somewhererererererere over the internet.

bye bye and have fun playing