What do the ending numbers written below the chord in this video really mean?
Video link:
Db 1, Db/F 1/3, Gb 4, Ab 5, Db 1, Db/F 1/3, Gb 4, Ab 5,
Fm7 3m, Bbm7 6m, Gb 4, Ab sus 5 sus, Ab7 5, Fm7 3m, Bbm7 6m, Gb 4, Ab sus 5 sus, Ab 5,
Db 1, Ab 5, Bbm7 6m, Gb 4, Db 1, Ab 5, Gb 4, Ab 5, ...
Db means the D flat triad. But what does 1 mean? Is that the keynote pitch? (like the middle C is C4?) or is that tempo?
Db/F 1/3 means the inverted D flat triad with the starting F base. But what does 1/3 mean? Is that the keynote pitch?