To all teachers and students:
Here's a new youtube clip on how to use mCircle in two steps.
mCircle is of course a free online resource and it does not require any subscription or sign in.

The tool finds all substructures contained in a main structure (for advanced players only) such as upper structure triads often use in improvisation and chord voicings.
Ariel J Ramos
Musician & Music App Developer
mDecks Music Apps Mapping Tonal Harmony Piano Voicings