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Kudos for the decision to GIT the work!</div>
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<b>Chris Park</b> </div>
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synthCube & SmallBear</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 Eric Brombaugh via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> Wednesday, July 16, 2025 4:44 PM<br>
<b>To:</b> Pete Hartman <pete.hartman@gmail.com>; brianw <brianw@audiobanshee.com><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] MIDIVerb reverse engineering</font>
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<div class="BodyFragment"><font size="2"><span style="font-size:11pt;">
<div class="PlainText">There are links to all four Youtube videos in the Github README - just
<br>
scroll down. I've also posted the presentation slides which provide a <br>
high-level overview of how the DSP works - look in the 'doc' directory.<br>
<br>
Eric<br>
<br>
On 7/16/25 1:21 PM, Pete Hartman wrote:<br>
> I'm not sure the disposition of the videos, but I recall Paul describing <br>
> all this discrete logic and the pipeline in them.<br>
> <br>
> Pete<br>
> <br>
> On Wed, Jul 16, 2025 at 3:08 PM brianw <brianw@audiobanshee.com <br>
> <<a href="mailto:brianw@audiobanshee.com">mailto:brianw@audiobanshee.com</a>>> wrote:<br>
> <br>
> Thank you!<br>
> <br>
> I believe that it is very worthwhile to preserve knowledge of<br>
> vintage electronics design.<br>
> <br>
> I took a quick look at the collection of files, and specifically the<br>
> schematic. It seems that the "DSP" is actually implemented via<br>
> discrete logic chips. I also noticed that there is a pipeline which<br>
> is potentially quite confusing. Do you have a high-level overview of<br>
> how this "DSP" works?<br>
> <br>
> I recall looking inside my A.R.T. MultiVerb back when it was new,<br>
> and it also seemed to have discrete "DSP" controlled by a too-slow-<br>
> for-digital-audio-sample-rates 8-bit MCU. I've long been curious how<br>
> that worked.<br>
> <br>
> Brian Willoughby<br>
> <br>
> <br>
> On Jul 16, 2025, at 12:35 PM, Eric Brombaugh wrote:<br>
> > Back in 2021 Paul Schreiber and I reverse engineered the MIDIVerb<br>
> I and although Paul posted a number of Youtube videos to discuss<br>
> what we'd learned, we decided at that time to keep the design<br>
> materials we'd generated from that effort private. Now that Paul is<br>
> no longer with us I've open-sourced the materials on Github:<br>
> ><br>
> > <a href="https://github.com/emeb/MIDIVerb_RE">https://github.com/emeb/MIDIVerb_RE</a> <<a href=""></a>https://github.com/emeb/<br>
> MIDIVerb_RE><br>
> ><br>
> > This repository includes schematics, presentation slides, source<br>
> code for the disassembler, emulator and compiler, as well as SPICE<br>
> and Verilog models of the logic. Anyone at all curious about how<br>
> this product democratized the world of algorithmic reverb is invited<br>
> to take a look - it's a fascinating glimpse into 1980's minimal TTL<br>
> design and a testament to the genius of Alesis founder Keith Barr.<br>
> ><br>
> > Eric<br>
> <br>
> <br>
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