Originally Posted by: Lao_Tzuwhat is the chord formula and the difference between add chords and sus chords ...

Suspended chords do not have a 3rd (major or minor); they SUSPEND the 3rd by "moving it" to a 2nd or 4th.

Added chords do have a 3rd, IN ADDITION to a 2nd, 4th, 6th; they "add to the chord" as well as having a 3rd.

Do you understand my reply about how suspensions work in diatonic systems?