dead simple synth is a simple synthesizer that generates audio using the very excellent tone.js web audio framework .
To begin playing, click on any of the keys on the keyboard. The synth captures the notes on its screen. If you add more notes than the screen can display, use the scroll bar on the the side of the screen to review notes outside of the display area.
Once you have played your notes, play the song you've created by clicking the PLAY BACK button.