The basic synopsis of it is this...for every scale degree there is a roman numeral...ie a major scale
C D E F G A B
I ii iii IV V vi vii
G A B C D E F#
I ii iii IV V vi vii
As for upper case and lower case you can get into that later...
this way if you are making a chord you have a bit less confusion and have a better understanding of the functionality of the chord and its relation to the root...
ie if you have a chord Gmaj7b5 you would right it as V7 or V7 of I
because you would know that G is the 5th of the scale of C and its a 7th chord...also instead of writting letters and figuring out what Gmin, G7add9, Gmaj6...to write its all general and is all related to the scale you are in...quick for site reading...It seems odd until you start learning it...its all just a replacement of the notes so you have no mix up between numbers and letters...ie I6
in Cmaj this would be a CEG chord in first inversion or EGC
I hope this helps but it probably wont!!
peace
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peace
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"Hopefully one day i will be known as a synth programmer"
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