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Messages - Xavier

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PreenFM2 / Re: harsh noize when midi in
« on: November 17, 2019, 08:55:14 PM »
It works as should, if preen fm2 is plugged in vi usb to PC before i open Ableton.
but problem with changeing patch stays... once i load patch, i cant change it to different presset


It's difficult to understand what's going on.

If Turning encoders does nothing  : try to disable "midi thru" in the "Tools->Set" Menu.
If the problem is something else, please try to explain what you do.


PreenFM2 / Re: Master tune???
« on: November 17, 2019, 08:52:23 PM »


I know it's missing for some people.
A forum member Lokki made an alternative firmware with this feature :

Should not be hard to merge with official firmware, i just miss time.


« on: November 17, 2019, 08:47:40 PM »


What do you mean by the "sound changes" ? Does the preset name change ?
Maybe the Keystep sends some program change controls ? You can try to set "Program Ch." to "No" in the "Tools>Set" Menu

PreenFM2 / Re: HOLD and turn Preen knobs for faster parameter editing?
« on: October 28, 2019, 09:39:55 AM »
Rather than pressing the encoders to ZERO the value would it not be better to HOLD and turn to increase the rate of change x10?
I've found it pretty slow and frustrating to change large value ranges, I think this would make editing a lot faster and enjoyable.
Thank you for listening,

Such as pressing the INST button and turning encoders.
Very beginning of the doc  ;)

Has anyone programmed any midi controllers to fully edit the Preen?
All my controllers only do CC's so I can only semi-edit the Preen.

Yes CC editing is very limited. NRPN allows finer tune and greater number of parameters.
You still have the PC/Mac standalone/plugin editor :

PreenFM2 / Re: preenfm2 editor 2.08.4 (November 25th 2017)
« on: October 19, 2019, 09:29:04 PM »

I updated the git repository with the version i have on my macBook.
Let me know if you can do something with the project or if something is missing.

PreenFM2 / Re: preenfm2 editor 2.08.4 (November 25th 2017)
« on: October 19, 2019, 08:13:47 PM »
To be honest i don't remember too much how it compiled with MacOS.
I didn't spend lots of time on it and i never use Xcode except for a couple of projects i ported on macOS.

1) No, all Juice files are included in the Git repository.
2) I first didn't understand what you meant... then i looked at git, and it seems i forgot to push the builds/MacOs folders  ::)
I'll try to do that later today.

PreenFM2 / Re: preenfm2 editor 2.08.4 (November 25th 2017)
« on: October 14, 2019, 09:46:24 PM »

Hi Kyoto,
"Is It Too Early To Upgrade To macOS Catalina?
The simple answer at this point, in October 2019, the answer is YES, it is absolutely too early."

Someone has to take the code ( and to recompile it with 64bits flags in XCode on macOS Catalina.
I haven't yet updated my macbook.
I'll eventually do that later but i secretely hope someone will give a try before  ;)

PreenFM2 / Re: What are you all using to sequence the PreenFM2
« on: October 10, 2019, 09:10:18 PM »
Thanks observer for the list  :)

I can add :
. Korg Gadget : Taipei instrument allows external midi
. Cubasis
. Modstep
. KRFT (very unique)

PreenFM2 / Re: Big Problem..
« on: October 06, 2019, 10:32:53 PM »
I thought we could feed the preen by usb port but apparently no.

Yes you can. Check jumper Jmp2 is ON.

In any case I love this synth and I want to say congratulations and thank you for creating it :)

Thanks  :)
And congrats for having fixed everything ;)

PreenFM2 / Re: Big Problem..
« on: October 04, 2019, 10:28:40 AM »
I changed the MCP4922 and the 6n1372, the sound came back and the midi too. (yeah!)

Great !  :)

But I discovered a new problem ...
when I want to save patches or settings the PreenFm2 freeze, nothing responds ..
I changed usb key (in fat32), put the latest firmware (2.10) but nothing works.
The usb power does not work either and he does not read the dx7 presets too.
it's as if he could not read and write on the key .
Any idea what this can be?
If it cannot read and write on the key : USB key problem.
As the Usb key is directly wired to the Microcontroller, that cannot be other components.
The first USB key must be burned as it cannot accept more than 5V.
Format it again copy the /pfm2/ fodler from the zip file.
If it still does not work try another USB Key.

"The usb power does not work either" : What do you mean ?

PreenFM2 / Re: anyone selling his preenfm2?
« on: September 28, 2019, 02:14:15 PM »
thank you...! I've heard that the plexi case is noisier than the metal case.. anyone knows if it's case?
also heard that alumi can help solve some noise under the screen on the metal case don't know if it work similarly on the plexi case

I assume you talk about the 13.2Khz noise that comes from some preenfm2.
It comes from the Yellow Oled display and can be mitigated with a shield. There is a sticky thread in the forum about that.
LCD does not produce any noise, and people who recently bought a blue OLED reported it's OK too.

In the shop above they redesign the PCB to have SMD components, so it's not fixable if one of the component dies and won't be supported here.

PreenFM2 / Re: Strange behaviour starting up
« on: September 27, 2019, 08:52:01 AM »
...I will try a lower value resistor or a jumper when I have time later. Then audio...

The "Led"  is the Display power connection.
So it must not be empty or it won't work correctly.

The 22ohm allow the "Yellow OLED hiss mod". Not sure it's still usefull with the latest BLUE OLED.

You can just solder a resistor leg instead at the "Led" points.

PreenFM2 / Re: New filters
« on: September 27, 2019, 08:48:37 AM »
@Xavier, thanks for the hints, and the cpu usage will be very very useful ! but unfortunately i have missed something as the displayed % was stuck at 0 when i tested.. i will investigate more this weekend.

Not sure if you set DEBUG=1 or if you just removed the line above.
But :

Must also be enabled here :

PreenFM2 / Re: Big Problem..
« on: September 26, 2019, 10:51:11 AM »
The 6n137 (midi optocoupler) as well as the 2 MCP4922 (DAC) have a max VCC of 5.5V in their spec.
On you picture you show 6.8v and they may have received more when your 7805 crashed with the 16v input.

So they may have been damaged.

When you press MENU+on of the 5 left button, the preenfm should play a sound.
If you see a note replacing the "I" of the first line, but  hear no sound. You can try replacing your DACs.

If you have an other 6N137 in stock, you can also try to replace it.


PreenFM2 / Re: New filters
« on: September 26, 2019, 10:42:53 AM »

Thanks for continuing working on that  :)
I hope to have some time in the near future to really take a look.

Have you trids to use the DEBUG part that show the CPU usage of the audio loop ?

The 2 Last algos are the ones that use the more CPU.
And using the LFO, env1 & 2 and Step seqs in the matrix also takes some CPU.
Always good to check the 8 voices with all LFOs and a filter can still play correctly.

That can help to detect if one of the filter takes more CPU then it should.


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