This is a web-based synthesizer that visualizes subtractive synthesis over time. Use your keyboard to play notes (hover over the piano icon to view a key-mapping). Each note appears on the isometric canvas represented by its voltage-controlling ADSR envelope (learn more here). Time progresses on the x-axis. Note pitch is mapped to its corresponding "track" on the y-axis. Pick a preset synth or adjust the sliders to explore the different possible sounds.