Copperline

Polyphonic synth keyboard in the browser, played from on-screen keys or the computer keyboard, with sine, square, saw, triangle and pulse waveforms. It adds filter and envelope controls and an oscilloscope, a Learn mode with home-row typing lessons on the keys, and a Songs mode with tunes such as Twinkle Twinkle and Jingle Bells. Built with Grok and shared on grok.me.

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