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<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">Ø<span style="font:7.0pt "Times New Roman""> 
</span></span></span><![endif]><span style="color:#1F497D">I</span><span style="color:black"> thought of using a frequency shifter as part of a pitch to voltage converter to try and eliminate the lag usually present.<o:p></o:p></span></p>
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<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">Ø<span style="font:7.0pt "Times New Roman""> 
</span></span></span><![endif]><span style="color:black">My (bad) idea was to shift up and then convert the higher frequency. 
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Why not use a LPF followed by an AGC circuit to make the lowest frequency dominant and then feed a frequency multiplier.<o:p></o:p></span></p>
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