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I always used linear VCOs in my designs in the 1970s. I think the key to them, at least then, was they were accurate. Exponential convertors weren't really that good back then.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Adam (synthDIY) <synthdiy@adambaby.com><br>
<b>Sent:</b> 16 March 2026 22:11<br>
<b>To:</b> Roman Sowa <modular@go2.pl><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Linear response VCOs?</font>
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<div>On 17 Mar 2026, at 02:01, Roman Sowa via Synth-diy <synth-diy@synth-diy.org> wrote:</div>
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<div><span style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">who
needs 8 or 10 octave continuous tuning range anyway?</span><br style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">No
analog synth has more than 5 and today most popular is 3-4.</span><br style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">That
means smaller range is enough and you can add octave switch as separate control to cover all frequencies of interesrt. Just like a knob doing that in any synth basicaly.</span><br style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span style="font-family:Helvetica; font-size:13px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">And
octave switch in DAC controled Hz/V VCO is just switching the resistance on the way from DAMC to VCO core. This is also exactly how it was done in vintage linear VCO synths like MS20 and many more.</span></div>
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<div>Agree. </div>
<div>Musically, in any given piece, many instruments are active in just the range of an octave or two.</div>
<div>The most characterful-sounding synths I have here are linear and are limited to about 4 octaves or less via Hz/volt external control (Korg 700, Roland SH-2000, TB303!)</div>
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<div>A</div>
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