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Hi first post. hope i can help with this number thang? please keep in mind that this is all to the best of my knowledge and I'm always willing to learn.  1. the number thing ( or the Nashville numbering system) doesn't care what scale you are using or what KEY cause that's the point. It is a way of communicating a chord progression or melody line indifferent to key or scale. It is all about intervals ( the distance in pitch between notes and the basic harmonies ( major, minor and half diminished triads and beyond) above those notes.  If you think in these terms it is much easier to transpose songs from one key to another and imo the more important issue is that you see the similarities and differences in chord progression more readily. This is because all the songs you play are now  in the same key or any key?  they are in the same key? because the Tonic is always (I) and that can represent  any starting pitch c,c# d d# ef f# gG#....c2....  How is this done?  First the numbering system says we will represent the intervals both horizontal, intervals in( a time line) a melody and vertically, harmony or two or more intervals  sounding at the same time ( notice I didn't say notes and all that that implies).  our basic ruler will be the Major scale.  in C major C=roman numeral Capitol I, D= rn small case ii E= iii F=IV G=V A=vi B=vii C=I. This is getting long I will continue this soon getting into all? that can be done with the system and why it works in current musick that has very little true KEY Identity as was the case back in history. Thanks BB