BeepBox is an online chiptune tracker. You can interactively edit patterns or enter single notes on a piano style keyboard. It makes it very easy to compose music - it manages scales, keys, tempo, and rhythm for you. It also has a waveform editor with which you can define new instruments. Download your work as .wav files. Seems to use Amiga .mod style patterns. You can also download the page to open later in a web browser or clone the sourcecode (https://github.com/johnnesky/beepbox) if you want to tinker with it or incorporate it into your own work.
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