No, iRp does not use m for minor and M for major.
While you can choose (in settings) to display minor chords as m or - (Cm7 or C-7),
(Most prefer ”-" since it seems to use less space in crowded measures)
Major 7th chords are always written using this symbol Δ.
CΔ is the same as CΔ7, (the 7 is redundant)
)BOB
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