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<p>be adjusted by changing the voltage. Moog designed his synthesizer around a standard of one <a href="page.php?w=volt">volt</a> per <a href="page.php?w=octave">octave</a>, and used voltage to control <a href="page.php?w=loudness">loudness</a> with <a href="page.php?w=Voltage_controlled_amplifier">voltage-controlled amplifiers</a> (VCAs).</p>

<p>Moog developed a prototype with two VCOs and a VCA. As the VCOs could output voltage, one could be used to <a href="page.php?w=Low-frequency_oscillation">modulate the output of another</a>, creating effects</p><p>
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