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Update on Juno 2 emulator

#1

Hi there,

A quick note on the Alpha Juno-2 emulator I working on, It’s far from finished but you can check it here:

It converted the Juno-2 presets to a .snaps ; you can play a little bit with it :slight_smile:

What’s done :

  • waveforms (DCO) ,
  • LFO, plugged to DCO
  • VCF

What’s working, but not like J2 :

  • basic HPF filter
  • VCA / VCF Envelope

Whats remains to be done :

  • LFO on VCF
  • correctly emulate HPF
  • correctly emulate VCF env
  • Dynamics, bend, portamento
  • a thousand of other things

the code is far from clean, probably not optimized, but it’s cool, I learn as I go (that’s the goal !)

Cheers
Michel

#2

Great work. Some really nice presets!

#3

Can you explain how you are getting the data to fill your arrays from your Juno? That’s cool, but how exactly are you doing it?

#4

Sure,
I plug my juno to my computer and I use sonic-visualiser (https://sonicvisualiser.org) in order to measure the data.
Most of the Juno-2 settings are 0-127. I usually take samples each 10. For instance if I want to measure the attack, I take a square oscilator in C3 and take samples at 0, 10, 20… :

sonic
sonic.png998×445 23 KB

I can have a approximate measure of the relation seconds <-> Juno setting. Afer I use google sheet with the interpol add-on (https://sites.google.com/view/interpolation/home)
in order to fill the gaps

Capture%20d%E2%80%99%C3%A9cran%20du%202019-11-02%2001-03-58
Capture d’écran du 2019-11-02 01-03-58.png1240×650 58.5 KB

I copy-paste the data on a file, a quick awk and I can put it directly into the csd

It’s not perfect, but at least I have something to begin with, and far better than my previous method (by hear :rofl:)

#5

Thanks for sharing. It’s a very interesting approach.

#6

Hi Michael.

I tested this synth yesterday and I must say it’s absolute gold! It really has that 80s analog sound and feel.

I lost two hours yesterday while testing it’s presets and I really enjoyed it. This is probably my favorite synth now. :slight_smile:

However, in some presets there is strong clipping when I play more than one note. I will provide some examples to the github issues.

#7

Thanks for the feedback :slight_smile:
I uploaded a new version adding chorus and correcting a few things, don’t hesitate to try it !
I also uploaded another tone bank (the “memory” Juno-2 bank) just rename it alpha-juno2.snaps

Cheers
Michel

#8

Love it <3 The Juno 2 was my first synth as a kid and that “Synth Brass” preset was indeed a favorite that I tried to reproduce in the song Papageno on Spotify etc.
I have a vague recollection that I somehow managed to send presets etc via sysex midi to my amiga back in the days… Hmm. maybe there’s a sysex “data set” somewhere that could be used. However, the work via ‘sonicvisualiser.org’ and a data sheet is just marvelous. Keep up that great creativity.

#9

I think @Michel has now added a way of grabbing the presets from the JUNO and passing them to his clone?

#10

Yes, I coded a small opcode that read sysex and I included factory presets in the emulator.
I’m still coding the “save” part.
There are plenty of presets available here:
http://www.llamamusic.com/mks50/mks-50_patches.html
I test some of them and they work with my emulator :slight_smile:
(not all of them work, though… :-/)

#11

This is the new repository (and new name !) for my Alpha Juno 1 / 2 MK-50 emulator : June-21

What’s done :

  • Load from syx extracted from Juno’s
  • waveforms (DCO)
  • LFO, plugged to DCO
  • VCF
  • HPF filter
  • VCA / VCF Envelope
  • LFO on VCF

Whats remains to be done :

  • Dynamics for VCF & DCO
  • Bend, portamento, aftertouch
  • Some sounds are not working
  • general sound improvement
  • Save presets

Have fun !

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#13

A quick update on things implemented :

  • Dynamics on VCF
  • pitch bender
  • emulation is globaly more accurate, more tones sound as intended
  • presets can be saved

Cheers for New Year’s Eve !

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#14

That’s a nice NY gift! Thanks :wink:

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