Live demo

Instructions

Open index.html
Click on the piano keyboard (or press SPACE) to start playing
Please note that you can click only the light blue buttons on the keyboard
To stop, press SPACE
Adjust the parameters as you like, toggles/sliders work while playing, while the others take effect on the first restart

Plays chords according to predefined progressions, in various keys taken from the Circle of fifths
It always starts from the key you pressed; if you use SPACE, it starts from A3 note (so the first key is A major or A minor)
At times, shifts to a new key (using pivot chords) according to the rules chosen in the select field
To modulate from a major key to its relative minor, it makes use of ii - iv correspondence or iii - i correspondence (in the latter case it doesn't switch to the strict relative key, but to its neighbouring key)
To modulate form a minor key to its relative major, it makes use of I - vi correspondence or VI - I correspondence (in the latter case it doesn't switch to the strict relative key, but to its neighbouring key)
At times, shifts to a new progression
At times, makes a chord inversion (if Inv parameter is toggled on)
Rhythm is generated randomly and changes at each restart