MOOG 3P MIDI CV Converter question.

The Moog Forum Modular Forum
1

This is first time to post in forum.
I have been struggling to get right octave tuning with several MIDI - CV converter, I believe MOOG Modulars were set to slightly odd Voltage per octave?
I have been trying to right pitch and tuning but not much luck so far.
I have tried MIDI MUSO CV-12 https://midimuso.co.uk/index.php/cv-12/
Beststep Pro with internal tuning
Kenton Pro Solo

So far best result with Pro Solo however still will out pitch going higher octaves.

Really appreciated if anyone has anytips!

2

Moog modulars / oscillators follow the 1V/oct characteristic. So if you apply exactly 0V, 1V, 2V etc. to the CV input there must be exact frequency doublings. If not the oscillators have to be recalibrated. Seems that “SCALE” is misconfigured.

This issue is not in responsibility of the MIDI2CV interfaces.

3

Thank you.

My Moog 3P has been this since day 1 which arrived back 2018 I raised couple of times to support but just recommended to buy Kenton interface.

https://www.youtube.com/watch?v=ZGZNY1ut3dY

Sounds they finished support for modulars but do you know any tip to carriblate?

4

They decided to shut down the modular business. Don’t ask me why. The circuits are of rather low complexity, easy to handle and easy to maintain.

I still consider the sound of Moog modulars as the best modular synthesizer sound quality in the world. So if you are an owner of an original Moog 3P you are a lucky one.

I love the sound and the concept that much that I decided to clone a complete System 55 Modular. See my corresponding web site:

https://www.analog-monster.de/mmclone_en.html

With this project I gained a lot of experience in analyzing, building, maintaining, repairing and improving Moog Modular circuits and modules. Once I repaired an original Moog 904B High Pass Filter of the British music producer Andy Gray just because I cloned one for my System 55. See

https://www.analog-monster.de/repair_904B_en.html
and a thread in this forum:
https://forum.moogmusic.com/viewtopic.php?t=35381

So the answer to your question is “Yes, I have tips and hints”

Both VCO series 901 and 921 are exponential VCOs which can be scale trimmed. If you have any circuit descriptions you should be able to locate them on your VCOs. These trimmers are the key elements for calibrationg your VCOs behavior. You should check this first.

If that does not help: I developed an Autotune Module especially for the 901 oscillators in the world (The module works with other oscillators as well of course, like my Oberheim SEM clone). The problem of a lot of 901 VCOs is the annoying necessity of recalibrating and retuning them from time to time. I saw this behavior in my own 901 clones as well.
As a feasibility study and as I wanted to keep the 901 VCOs due to their wonderful sound I developed a new kind of module for Moog Modulars which offers a post-installable autotune function. It works, but is an external additional module of course. See

https://www.analog-monster.de/t908_en.html
and a thread in this forum:
https://forum.moogmusic.com/viewtopic.php?t=36703

And last but not least: Due to all of the discussions here I decided to launch a company which offers support on Moog Modulars, Moog Synthesizers and for doing new developments, especially for Moog Modulars (as Moog does not do anything on this any more :imp:). An example: For my customer Andy Gray I developed a VCA extension for his CP3A module which allows him to voltage control the CP3A behavior.
See forum thread https://forum.moogmusic.com/viewtopic.php?t=36814 for details

So you could send your 3P to me for maintenance if you like.

If you are interested send me an email (find address on my web site). Find more details of my new developments for Moog Modulars on my System 55 Clone Page (link above).

5

That is all pretty awesome!