Loving the clear, laid out explanations for everything on your website but I still don't know what an arpeggio is.

Does this indicate that, when you count backwards to grab a 'tone-Pitch', below 'Tonic, you enter into a different ( flat ) key? C, Db, Eb, F, G, Ab, Bb,-C- D, E, F, G, A, B, C. 8/1,2,3,4,5, 6, 7,'1',2,3,4,5,6,7,8/1