Comment 1

Those are sixths…
6ths: Bb + Gm, F + Dm, etc.
M7ths: Bb + Dm, F + Am, etc.
m9ths: Bbm + Fm, Fm + Cm, etc.
11ths: A + G, C + Bb, E + D, G + F
Those would work… I don’t have an optigan 🙁

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