Selected Chord
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Duplicate: creates two child branches, both identical to the selected chord.
Add Fifth Before: creates two child branches - the first is a fifth above the selected chord, the second is identical to the selected chord.
Minor Third Up/Down: shifts the root note by a minor third for octatonic substitutions.
Change Chord Type: changes the selected leaf node to a different chord type.
Play Progression: plays all leaf nodes in order on a loop.
Reset Tree: clears the tree to a single root node.