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With a 10 bit MDAC or DPOT, any zipper noise should be 60dB down on full house. Now of course we don't operate at full house so you have to take your headroom off that but chosen carefully it shouldn't be hugely annoying. But if it is there are some DPOTS
with zero crossing switching included so they only change gain as you pass through zero, eliminating most annoyances.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Tom Wiltshire <tom@electricdruid.net><br>
<b>Sent:</b> 21 March 2023 14:56<br>
<b>To:</b> Roman Sowa <modular@go2.pl><br>
<b>Cc:</b> Mike Bryant <mbryant@futurehorizons.com>; synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Niche ACM-1 how's this thing work?</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">This is a good point. MDACs or even digital pots work best in situations where you set a value and then leave it. That's ok for quite a lot of programmable stuff, but it doesn't suit things
where there's an element of performance control likely. For that, a DAC controlling a VCA is a better bet, since the VCA's CV can be heavily smoothed to avoid any zippering. A mixing desk is a bit of both depending on how you use it, so it's a tricky one.
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<div class="">The old Sequential Pro-FX 500 system I was looking into some months ago used plenty of MDACs ( the 7524, 8-bit, still available) for audio level control. It was probably a top-end solution at the time.</div>
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<div class="">On 21 Mar 2023, at 14:38, Roman Sowa <<a href="mailto:modular@go2.pl" class="">modular@go2.pl</a>> wrote:</div>
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<div class=""><span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:normal; 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">This
may not going to work in every application though. Imagine Buzz Lightyear talking to Woody: "glitches and zipper noise, glitches and zipper noise everywhere"</span></div>
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