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Message: <blockquote data-quote="Janx" data-source="post: 5053975" data-attributes="member: 8835">the OP is talking about the video game controller for Rock Band, not real guitars.there are 5 fret buttons1 button = 1^5 combinations2 ubtton = 2^5 combinations3 buttons =  3^5 combinationsresolve the "to the power of" bits, and then add them upI'm assuming I expressed it correctly that 2 buttons out of five is 2^5 and not 5^2, which I'm pretty sure I'm right because 8^2 expresses 256 combinations which is a byte.A real guitar typically has 6 strings and 22-24 frets.  A true chord requires 3 notes, though a power chord is only 2 (note a true chord, it uses the root, and the fifth).  A chord may use more notes than 3.Thus, on a real guitar, for a "chord" you might hold down 2-6 notes and strum 2-6 strings.  Not all chords use all the strings.I also note that you called the buttons ABCDE, implying using the notes in order.Assuming you were writing a game to play the guitar just as music:If you were going to make each button be a chord, you might be better off thinking of them in terms of common chord progressions.Thus, if the song was in the key of F, and the rock tune went in a I-IV-V-I progression, you'd want each button to represent that (not using all the buttons, you could make them be useful by programming them to be III and VI.F =I  (6th string, 1st fret)G =II  (6th string, 3rd fret)A =III (5th string, open)Ab=IV (5th string, 1st fret)C =V (5th string, 3rd fret)D =VI (4th string, open)Eb=VII (4th string, 1st fret)F = VIII (4th string, 3rd fret)I play bass and guitar, so I had to learn where all the notes are.  From there, learning the parts of a chord were needed, thus I learned where they are relative to the root note (in this example low F).What they translates to is you'd want your notes on the buttons to be:F, A, Ab, C, DPlay them as chords, and you could cover a ton of rock tunes.</blockquote>

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