Chord Synth
Build a chord progression — drop it and a I–V–vi–IV in C major plays through a polyphonic synth voice; a Clock drives playback. Edit on the circle-of-fifths + timeline: pick a key and click the chords that fit, type a roman-numeral progression (e.g. "I V vi IV"), drag blocks to move/resize them, or select a block to re-voice it (quality + inversion). A Tonnetz scope on the output shows the harmony as GEOMETRY — each chord lights up a triangle on the lattice and the progression glides between them, drawing its path (it reads the summed voices, not one note). A FUNCTIONAL preset (explicit nodes + connections).