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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The reason I like octave switches, coarse,
and fine pots is that sometimes you want to grab a knob and go “rowwwrrowwww”
– you can only do that with a coarse pot. However, the coarse pot
should probably have a centre detent so that it can be “stuck” in
place for normal musical operation, which only requires the octave switch and
the fine pot (which has a range of a bit more than one octave).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The ultrafine pot (which has a total range
of about a semitone or less) is really only for calibration purposes, and doesn’t
need to be on the front panel at all. Indeed, it could be a pot you plug
into a header when tuning, or a miniport (or, less conveniently, a trimpot) on
the PCB. I like to calibrate by frequency powers of 2 (32, 64, 128 Hz,
etc), so the ultrafine pot is really convenient for dialing in precise
frequencies.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Synth-diy
[mailto:synth-diy-bounces@synth-diy.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Mattias Rickardsson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, January 23, 2020
6:15 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Spiros Makris<br>
<b><span style='font-weight:bold'>Cc:</span></b> synth-diy mailing list<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [sdiy] Suggestions
for oscillator coarse control methods?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Thu, 23 Jan 2020 at 11:31, Spiros Makris <<a
href="mailto:spirosmakris92@gmail.com">spirosmakris92@gmail.com</a>> wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I am leaning towards an octave switch, fine and coarse pots.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>One minimalistic combination could be:<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>- an octave switch with many octaves selectable plus a "wide"
setting<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>- a tuning knob that spans an octave (or what you'd prefer) except in
the "wide" mode where it spans the whole wide range.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>It all depends on the usecases, but having a super-coarse pot available
at all times could ruin the precision.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Btw, the above could be combined with a finetune knob as well, if
that's desired.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>/mr<o:p></o:p></span></font></p>
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