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Messages - Xavier

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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.


PreenFM2 / Re: Strange behaviour starting up
« on: September 26, 2019, 10:38:02 AM »

The 3.47v can be because the blue oled draw more currant than the yellow.
You can try a smaller OLED resistor or simply shortcut it to check if that solve your problem.

You should also resolder ALL your junctions related to the OLED. There seems to be too much solder.

Try to resolder the 16 on the PCB, the 16 on the display and the 20 upper points of the preenF405.
Put your hot iron on each point and wait for the small ball to melt and go down.


PreenFM2 / Re: STM32F4 - serial (which is good/best, wich is bad?)
« on: September 20, 2019, 05:45:44 PM »

The parts of the preenF405 board are listed here :
So it's a STM32F405RGT6.

If you buy another stm32f4 model you'll have to modify the firmware and that can be a lot of work.



Difficult to say anything from the mp3.

Try the following :
Set the number of voice of I1 to 1. The other I2, I3, I4 to 0.

Instrument 1 :
Set velocity to 0.
Use Algo 2. And make Sure mix1 is 1.0.
Is it better ?
There's good chance what you hear is the limit of the preenfm2 DAC when the oscillator have no enough bits.

You may want to verify the resistors 115K and 1.8K they're used to link the 12 bits DAC with 6 bits of the other one to make a good sounding 18bits DAC.
If those resistors are wrong, the resolution is only 12 bits.

PreenFM2 / Re: Arturia Keystep sequencer problem
« on: September 19, 2019, 10:14:20 AM »
That's weird.
I have a beatstep (must be the same internal as a keystep) and never saw this problem.
Is midi thru turned off ?
The additional voices comes from other instrument or only instrument 1 ?

PreenFM2 / Re: Big Problem..
« on: September 19, 2019, 10:12:33 AM »

Your 7805 maybe dead.
Plug a USB cable that provides directly 5V and check voltage as descibed message #6 here :

If the leds blinks it means the preenF405 is still allive. Does it still make sound ?
If yes he problem can be the only the screen.

PreenFM2 / Re: Cannot read or write to USB storage
« on: September 04, 2019, 03:13:12 PM »
Hi Nick,

That really sounds like a problem with your USB stick.

Try to format it again in fat32.
Then unzip this file.
on it.
You should have everything in a /pfm2/ folder.

Optional : add in the /pfm2/ folder the 2.10 binary for Eurorack :
So that you can easily flash it if needed.


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