iIn node allows you to get pitch and gate inputs for notes played on a computer keyboard
            or MIDI input device. The pitch value is the frequency of the note played. The gate value is one
            when a key is held down, or zero otherwise.
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            <p>
            This <a href="#31">example graph</a> uses the pitch value to directly control
            a sawtooth wave oscillator. The gate value is then multiplied by the oscillator's output, so
            that you only hea