nice to have more chord in gammas

[sugizo]

nice to have more chord in gammas :
3th tones e.g. diminished, augmented, etc
4th tones e.g. diminished 7th, augmented 7th, etc
5th tones e.g. major 9th, minor 11th, etc
6th tones e.g. major 9th 11th, dominant 9th 11th, etc

created same web app before, but still learn your coding flow

ref
https://sugizo.pythonanywhere.com/music/fretboard/form_arpeggio_in_fretboard

best regards