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In the technical notes on another site</div>
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"The 4 photo resistors and LEDs are assembled within an small lightproof box"</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 Sean Ellis via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 12 April 2026 15:51<br>
<b>To:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> [sdiy] Doepfer's new vactrols?</font>
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I was looking at the Doepfer quad slew module and noticed something odd, it doesn't have any VCAs and very few parts. It does have a giant black box that looks a lot like a regulator but it isn't, could it be a quad vactrol? I don't see any markings and the
same unit appears on the Source of Uncertainty module in place of it's vactrol. Has anyone seen these or could they be custom jobs?</div>
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High res pictures here:</div>
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<a href="https://www.thomann.se/intl/doepfer_a_171_4.htm">https://www.thomann.se/intl/doepfer_a_171_4.htm</a></div>
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<a href="https://www.thomann.se/intl/doepfer_a_149_3.htm">https://www.thomann.se/intl/doepfer_a_149_3.htm</a></div>
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