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Messages - Xavier

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PreenFM2 / Re: external filter
« on: Today at 01:08:25 PM »
No there's no CV out from the preenfm2. Neither anything close to it.
It would require a different mapping of the CPU pins in the main PCB and in the preenF405 so that we can use a internal DAC or maybe a PWM with Low pass filter.

PreenFM2 / Re: PreenFM Eurorack module
« on: April 16, 2019, 06:22:48 PM »
The firmware version P2_209AO.BIN cannot be used with the rebuild,
the modification is not implemented.
Version P2_209A.BIN has this implementation.

Really ?  ???
I cannot check this week as i'm far from home.
Can be a mistake when building the zip file.

PreenFM2 / Re: Power adapter advice
« on: April 15, 2019, 11:11:12 PM »
I'm not a power supply splecialist  ;)
But 'center negative' sounds wrong.
Luckily most of the power supply are 'center positive'.

PreenFM2 / Re: Share your creations using the PreenFM2!
« on: April 15, 2019, 05:08:19 PM »

Thanks a lot for sharing and for the nice words. :)

PreenFM2 / Re: Power adapter advice
« on: April 15, 2019, 01:36:36 PM »

With 7.5V the 7805 5V regulator will be cooler.

Plug size is 2.1mm.

You need 300mA or more, so it should be 99.9% of the available power supply.
The only thing is the polarity, must be ground outside which are the most common ones.

Any power supply that works with the Shruthi will work with the preenfm.
So you can google "shruthi power supply."


PreenFM2 / Re: rebooting the preen from menu?
« on: April 04, 2019, 05:20:31 PM »

Glad to read you like your preenfm2.

When an instrument does not make any sound (which should not happen), you can :
. Check the number of voice has not been set to 0 by a new preset you loaded for an other instrument.
. Press INST+MENU at the same time, this resets the audio engine.
If you lose sound and can reproduce please share the steps.

Presets are currently limited by RAM.
Bank names are preloaded so that the UI is more responsive. 
With 255 banks you can have 255*32 = 8160 presets.


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.


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