[sdiy] MIDIVerb reverse engineering

[Peter Pearson]

I have a MIDIFEX.  Backed up the EPROMs this afternoon.  I don't have time
or means to really validate this right now but I'm assuming they should be
good.  It's been collecting dust for a few years but worked the last time I
was playing with it.

https://www.dropbox.com/scl/fi/az014kip9xkxi2nh4i6a4/MIDIFEX.zip?rlkey=i99ggnfrzw077o4y4un9k6x0f&st=0zas6em4&dl=0

Here's the files download.  I'll leave it up for a week.  Will also send to
the DBWBP EPROM  database so it's hosted somewhere.

On Wed, Jul 16, 2025 at 6:24 PM Gordonjcp <gordonjcp at gjcp.net> wrote:

> On Wed, Jul 16, 2025 at 12:35:35PM -0700, Eric Brombaugh via Synth-diy
> 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:
>
> Based on the circuit diagrams from the videos, some discussions on here
> and on Reddit, and a bit of experimentation, I came up with this:
>
> https://github.com/ErroneousBosh/BarrVerb
>
> It downsamples to 24kHz pretty stupidly, so it only "plays properly" for
> 48kHz samples.
>
> If I could find a working MIDIFex ROM I expect it could be cooked into a
> format suitable for this, too.
>
> --
> Gordonjcp
>
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