Those chord symbols can be entered using buttons in the editor or the whole iRp compatible chord quality (that's all the stuff after the chord letter) can be selected from a list you can display in the editor. Read everything that's behind the question mark "?" At the top of the editor page for detailed instructions. )BOB
Hi bettyboop. The "o" symbol means Dimished. The "triangle symbols means Major seventh.
Dimished chord formula is:
I-b3-b5. (Cdim or Co is C-Eb-Gb)
Major seventh formula:
Its a Major chord plus another Major third
1-3-5-7 (C-E-G-B)