A playable synthesizer with ADSR envelope control. Use mouse or computer keyboard.
Use the keys A, S, D, F, G, H, J for white notes (C4 to B4), and W, E, T, Y, U for black notes (C#4, D#4, F#4, G#4, A#4).
For the second octave, use Z, X, C, V, B, N, M for white notes (C5 to B5), and Q, R, I, O, P for black notes.
Click on piano keys with mouse. Adjust ADSR sliders to shape the sound envelope.