[sdiy] MIDIVerb reverse engineering

[Pete Hartman]

I'm not sure the disposition of the videos, but I recall Paul describing
all this discrete logic and the pipeline in them.

Pete

On Wed, Jul 16, 2025 at 3:08 PM brianw <brianw at audiobanshee.com> wrote:

> Thank you!
>
> I believe that it is very worthwhile to preserve knowledge of vintage
> electronics design.
>
> I took a quick look at the collection of files, and specifically the
> schematic. It seems that the "DSP" is actually implemented via discrete
> logic chips. I also noticed that there is a pipeline which is potentially
> quite confusing. Do you have a high-level overview of how this "DSP" works?
>
> I recall looking inside my A.R.T. MultiVerb back when it was new, and it
> also seemed to have discrete "DSP" controlled by a
> too-slow-for-digital-audio-sample-rates 8-bit MCU. I've long been curious
> how that worked.
>
> Brian Willoughby
>
>
> On Jul 16, 2025, at 12:35 PM, Eric Brombaugh wrote:
> > Back in 2021 Paul Schreiber and I reverse engineered the MIDIVerb I and
> although Paul posted a number of Youtube videos to discuss what we'd
> learned, we decided at that time to keep the design materials we'd
> generated from that effort private. Now that Paul is no longer with us I've
> open-sourced the materials on Github:
> >
> > https://github.com/emeb/MIDIVerb_RE
> >
> > This repository includes schematics, presentation slides, source code
> for the disassembler, emulator and compiler, as well as SPICE and Verilog
> models of the logic. Anyone at all curious about how this product
> democratized the world of algorithmic reverb is invited to take a look -
> it's a fascinating glimpse into 1980's minimal TTL design and a testament
> to the genius of Alesis founder Keith Barr.
> >
> > Eric
>
>
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