The keyboard uses a 2-operator FM Synthesizer to produce 100 pre-set voices, and also offers manual control of some (but not all) of the synthesizer parameters, so the user can create their own sounds...The built-in speakers are remarkably good (as expected on a Yamaha), but my example has an unusually hissy amplifier, and there is also a constant high-pitched whistle on the output...I have...
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