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Messages - Xavier

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PreenFM2 / Re: PreenFm2 wont start and display problems
« on: March 18, 2019, 10:03:18 AM »

Glad to read it's now working.
The power supply needed is a regular 7.5v or 9v ground outside.


PreenFM2 / Re: PreenFm2 wont start and display problems
« on: March 14, 2019, 11:39:38 AM »
I know the info on the PCB are not clear at all, but it's quite clear in the build doc  ;)
"f you have a PCB revision R5d, you’ll have an additional resistor named Oled on the right of the above picture .
Populate it with a 22 ohm if you have an OLED display or shortcut it with a resistor pin if you have a LCD display."

So With a oled display the "oled" resistor must have a 22 ohm resistor. This provide the main power of the display.

For the high pitch noise of yellow oled display :


PreenFM2 / Re: PreenFm2 wont start and display problems
« on: March 14, 2019, 10:04:06 AM »
Hi Ivano,

First jmp3 is only usefull if you want to flash the bootloader, so you don't need it. Should be open all the time.

What display did you have with yout kit ? OLED ? LCD ?
Is the "oled" resistor soldered ?

If it worked again after you unplug and plug back you display the problem seems to be here.
Resolder the display header on both the PCB and the display... double check there's no shorcut between adjacent pins.
Resolder the 40 pins socket of the preenf405. Also check for shortcut betwen points.
Make sure the preenf405 is well inserted.


PreenFM2 / Re: Preen doesn´t start - display is black
« on: March 11, 2019, 09:58:07 AM »
Hi Maria,

Except the display, everything is working fine ? the sound ? midi ? buttons, knobs ?

It's difficult to say if you diplay is damaged or if there is a soldering problem.
So this is your choice to buy a new display or not ;)


PreenFM2 / Re: p2_09ko.syx?
« on: March 08, 2019, 10:08:48 PM »

Step1 allows you to acces the usb drive without opening the preenfm2.

PreenFM2 / Re: p2_09ko.syx?
« on: March 08, 2019, 01:59:56 PM »

p2_09 is a very old firmware. And it would be a pity to use it on a preenfm2 hardware.
I stoped supporting the sysex firmware update because the USB update is much more convenient and fast.

Have a look at this page :
Step 1 : upload latest firmware on the USB key.
Step 2 : flash it !

Last firmware 2.09 is available here :


PreenFM2 / Re: PreenFM Eurorack module
« on: March 07, 2019, 01:19:21 PM »
We have realeased a DIY kit to build your existing PreenFM into Eurorack module.
Its a full kit. You will have all the parts you need to do it.

This is awesome news !!!  8)
Thanks Ardi for your work on that, I'll announce that tonight on facebook after i update github with the schema and the official CV firmware.

PreenFM2 / Re: preenfm2 editor 2.08.4 (November 25th 2017)
« on: March 04, 2019, 11:00:31 AM »
I just don't understand what the "Push" and "Pull" function does, could someone explain it to me ?


Push : all parameters of the preenfm2 are sent to the software editor.
Pull : all parameters of the editor are sent to the preenfm2.

Required in some situation to make sure both preenfm2 and editor are in the same state.
Those situations include new presets loaded in the preenfm2 or the editor, or after modifying some midi channel settings.


PreenFM2 / Re: Preen doesn´t start - display is black
« on: March 04, 2019, 10:55:54 AM »
Sorry for the late reply. I'm just back from vacation.

That's weird.
You should double check the 0/5V of the display header on the pircutre i attached above.
(With a 22ohm resisor on "oled" you should have around 4.2V on the display header power instead of 5v).
Also verify the the OLED resistor is acutally 22ohm... If to high that could lead to such a problem.

You can also try to shortcut the OLED resisotr with a metal part (resitor leg or something like this) and see if the display works properly.


PreenFM2 / Re: Slower LFO
« on: February 20, 2019, 09:02:38 PM »
Oh thanks! You are right, i'm programming sounds on the editor and I didn't checked on the unit screen. 100 seconds is great.
Is there a technical reason that the editor can't produce and send double decimal values for this particular setting?

No reason.
A programmer error  ;)

PreenFM2 / Re: Slower LFO
« on: February 20, 2019, 03:49:51 PM »
OK i got what you meant.
The limit is the PC/mac editor display.
You can change the value on your preen directly, or click on the field in the PC/mac editor and enter 0,01. Even if the editor shows "0.0" it should work.

PreenFM2 / Re: Slower LFO
« on: February 17, 2019, 05:26:50 PM »


Not sure why you say slowest LFO is 0.1Hz.
Actually it's 0.01 which is a 100 seconds period.
Did i correctly understand your question ?


PreenFM2 / Re: Preen doesn´t start - display is black
« on: February 16, 2019, 06:06:40 PM »
Thanks Maria, but these are very low resolution pictures it's not possible to see potential solder problems.

You should start by checking all your solder points.
Start by all the preenf405 and the display header.

Then have a look at the attached picture and with a multimetre check all colored points.
5V and 3.3v are all required.
2.5v is the DAC output and should not prevent the display to work.


PreenFM2 / Re: Preen doesn´t start - display is black
« on: February 13, 2019, 09:46:33 PM »
What do you see exactly about the USB. The USB key light ?
Can you see the content from the your PC ? That's weird, the preenfm should boot in midi device mode.

Plug the audio, and le me know if you hear a "pop" when you plug your preen.
You can also try to press and hold "INST" and then pree one of the 5 left buttons. You should hear a note.
If not then the problem is not the display.

You can read this thread :
And verify the different points shown of message #6.

That would help also if you can post a better quality pictures of your PCB.

PreenFM2 / Re: Preen doesn´t start - display is black
« on: February 13, 2019, 10:35:22 AM »

Is it the metal case from Van Daal Electronics ?
So your Display is an OLED one ?
If yes, the "OLED" resistor should be populated with a 22ohm resistor.


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