Click a triangle for its chord or a circle for one note; shift-click circles to hold notes. P, L and R move the current chord, Backspace steps back, Space plays the progression, arrow keys pan, + and − zoom, F fits the path.
Notes a fifth apart run left to right, major thirds climb to the right and minor thirds to the left, so every triangle is a triad: pointing up, major; pointing down, minor. Two chords that share an edge share two notes, and moving between them shifts a single voice by a step. Click a triangle to hear it, press P, L or R to flip across an edge, or type a progression and watch the path it takes.
Click a triangle for its chord or a circle for one note; shift-click circles to hold notes. P, L and R move the current chord, Backspace steps back, Space plays the progression, arrow keys pan, + and − zoom, F fits the path.