This button exists to comply with Chrome's
"no sound without user action" policy.
It also gives the WebAudioSynth time to adjust
the WebAudioFontFile that has already been loaded.

This is a simple demo, showing how the ResidentWAFSynth synthesizer from my WebMIDISynthHost project can be used in a Web application.

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To use this demo, hover your mouse over the coloured areas below.
Moving the mouse over an area sends the synth a noteOn message.
Moving it out again sends the corresponding noteOff.