Ok so I've got the new version out this one fixes a couple bugs adds 4 difficulty levels has combos and hit%s.
http://noah.wikidot.com/local--files/blog:12/Guitar.zip

Might just be WabbitEmu... but are the numbers supposed to bounce like crazy?
Also, you still have the bug where it ends with about 5 notes still on screen.

(P.S. On insane, at one point I got an 'Invalid Dim' error.)

Working on bouncing numbers and the notes still on screen I don't know what's up with the Invalid Dim error.

I had fixed the 'notes on screen' one by making the last 5 spots on the list (varies with difficulty) 'blank' or in my case '-2'.
Won't show up on the screen, and I'm sure you can think of a way to make them not count against you.

You know, if you wanted you could have the level data "string" not have to convert and during the detection of the keys use the expression of the string and also in displaying (you can make it express it once only and show up/detect it each loop).

Yeah I suck on the emulator too.Thanks for the screeny though.
Edit:Fixed the error that left notes on the screen.

I've figured out WHY Insane has an 'Invalid Dim'.
All I'm positive of is that it's trying to read L₁(129) when there's only 128 elements... how it's doing that when the repeat should stop the moment it's above the dim is beyond me.

(EDIT: I only looked at the situation [and code] for about 10 minutes... so don't hurt me if it's something stupid and simple.)

Here ya go.
Extensive research. =P