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gnocl::sound

I've created a documentation page for the gnocl::sound command and added it to both the local and gnocl.org repositories. The -onFinished command that I've added is still puzzling me. If the sample comes is played fully then the signal is not fired, if it is cancelled then it does! There's probably something simple about this that I haven't seen yet.

just added the test script to the demos and run them. Oddly, the -onFinished works perfectly here but not when run standalone! Now, I'm even more confused.

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