Help For FNaF Fangame

I am creating a FNaF fangame called Five Nights at FredBear's
You can visit it here : bit.ly/FiveNightsatFredBears

Why I pick Unity :
Although I don't have any scripting knowledge, I have used Unity the most.

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And there will be a music box system. Search up "music box fnaf 2" if you don't know what I'm talking about.

So here's how I want it to work like:

When value of musicBox equal -10, create AND move a gameObject(animatronic) to make a jumpscare.
musicBox is represented by a number, and time.deltatime would probably help in the music box winding down.
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A separate script to slow down the audiosource after the -10 seconds of time.deltatime.
This is optional because I don't know if Unity is capable of doing it.

I would like a texture system to fill it up, but a number display system would work well also.
What I mean by number system : When you wind up the music box it counts up, 10 being the highest.
Also when it "winds down"(pun intended) count down to -10.
------------------------------------------------------------------------------------------------------------------------------------------------Also, as you probably guessed, there has to be a button to wind it up, and this could just be a gameObject, or it could be a textured GUI button.

Thanks in advance,
Minecraft7089