First of all, don't expect too much from this project, I only made this because I got bored (when waiting for Jacobly's map generator for TinyCraft ) so I may or may not make a real game from it.
In fact, the note-displaying engine was made a long time ago but I was too lazy to make it display several notes at a time, so I forgot all of what I made. Then Samos on TI-Planet asked some help with his Guitar Hero clone and it reminded me of KoFiX.

So, why is it called KoFiX ? Because of FoFiX, the free Guitar Hero clone one computer. FoFiX is very flexible, allowing you to create your own musics to play with the game, or change the theme of the game, etc, while Guitar Hero is all done with nothing really modifiable. KoFiX (if one day finished) will at least allow you to create your own musics to play with the game beacuse I am too lazy to make songs myself

For now, it only displays notes (up to three at the same time), there is no way to play them nor hear any sound
And concerning sound, it is not a priority, I'd first want to make it at a decent speed for regular 83+ then I may add Full speed and sound.

Now what does it look like ? Compare the real Guitar Hero and KoFiX on Monsters by Matchbook Romance


(also, the demo download ↓)

Pretty cool.

Thanks
There is also a major problem with this project: If the notes go too slow, the game is not entertaining, but if they go too fast, the bluriness makes the game impossible to play. I tried inverting the screen and it is already better

I don't know how I should do key detection, so I made a poll. I describe the choices here:

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Autostrumming:
This means that as long as your fingers are on the right frets when the note hits the bottom of the screen, you have the point. Which means that if you have a sequel of identical notes, you just need to keep the frets down to have them all. This also means that if you press a fret for no reason, that doesn't remove points, only missing a note will remove points.
Easy to code and to play.

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Strumming required:
This means that to get a note, you have to keep the frets down and press the strum key. So to make a sequel of identical notes, you just keep the frets down for the whole combo and press the strum key each time a note hits the bottom of the screen. This is the solution that looks more like Guitar Hero than the other solutions. However, this may not be easy to play on a calculator (there would not be problems if we could plug the guitar controller in the calc but it is not very possible).
Easy to code, may be not easy to play on a calculator

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Option "Strumming: Auto/Manual":
Basically, this is if you don't want to vote the last one and can't choose between the first two ones
This means that the menu will include an option to let you choose between the first Autostrumming and required strumming.
Still quite easy to code and playable

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Tap Tap style:
This one is the worst choice I guess. That means that you have to press frets when the note hits the bottom, and only at this moment or you'll lose points. But that also means that when you have a sequel of identical notes, you have to whack the keys each time a note reaches the bottom. This is the most logical way to play but not the easiest way to play at all (when there are sequels of 3 notes chords) nor the easiest way to code.

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Now that you know everything, please vote, even if you don't plan on playing the game because I really don't know what to do

Sorry, I am French, what do you mean by "alt-strumming" ?
Do you mean "strumming at high speeds" ?
Or "strumming in alternatively upwards and downwards" ?

But yeah, that is what I thought. The problem is not even alt-strumming but also how to take the calcs in hands to press frets and strum ?

You can just put the calc on a table or your knees

And personally I haven't any problem on pressing [enter] or [clear] at a high speed level (I think that [clear] can be a good strum).

UPDATE
- Now score is calculated like this:
(notes you got)-3*(notes you missed+overstrummed)
Note that the score starts at zero, which is not a good idea
- Added the support for notes that don't need to be strummed.
Beware, it was coded GH III-style, not like in next versions. Which means that the note will be counted as good if you are holding the right key when it reaches the bottom, even if you started to press that key 10 seconds ago. So don't release the key too soon
(and don't try to hammer-on/pull-off, that won't work, you need to be holding only the right key )

Here is what they look like

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Also, I got an idea, thinking about Guitar Hero on a DS
What about this keymap (in spoiler) ?
The problems I see is that keys are not aligned on a 84+ and that there might be problems with the ON key
The ON key is getKey(41) but is it a real getKey() or a special command "getKey(41)" ? I must try (moreover, zTrumpet's KEYGROUP program doesn't allow me to test the ON key)
I don't know if this is doable but I think that could be a way of playing that looks more like the real Guitar Hero

Also, as usual, the download is below, with a screenshot of me sucking at my own game (I found an excuse: my keyboard doesn't support 4 keys at the same time )

UPDATE
Now with a shiny File browser
You can see I tested it with appvars with random names
There is just one bug with this, there are two appvars named Ft\uc that appears sometimes
Thanks to Matrefeytontias for the appvar repertoring through the VAT ^^
This also means that you need songs in your archive to play it, not only the App, so if you want to test it, you might want to download the appvar Monsters too ^^

And don't worry Matref, I don't use the same header as yours. Mine is "KoFiXsong"
And you'll have credits when the credits section is done (but I first need a main menu )

Also, I started to implement the keymap I said but the screen is not inverted yet. For now, the keys On, 0, . , (-) and Enter are from left to right, but soon they will be from right to left (with inverted)

so how did you make the appvar browser?