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Messages - Xavier

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PreenFM2 / Re: Saving preset into empty Bank/Combo slot
« on: March 29, 2017, 04:10:17 PM »

<Empty> means there's no bank.
Select an existing one to store your combo or presets.

You can create a bank from the menu : Tools>crea.
Or copy an existing bank on the USb stick directly from your computer and change the file name of the bank.

PreenFM2 / Re: Screen issue help!
« on: March 27, 2017, 10:46:50 AM »
Hi, sorry for the delay.
I don't think the issue can be because of the overclocking.
Did you buy your kit (prebuild unit ?)  from Van Daal Electronics ? I think they know this problem, try to contact them.
If not, what display do you have ?

PreenFM2 / Re: Voicing problem / feature?
« on: March 27, 2017, 10:45:03 AM »
The algo is the following, in order or priority :

1 . If a voice use the same midi note, the engine uses this voice and retriggers the sound...
2 . If there is a free voice (playing no note) use it.

After this all voices are playing note :
3 . If there is one or more voice that are in "release mode" (midi note off has been receive but the note is still playing), use the older one.
4 . If all voices are currently playing active note, any new midi note on will replace the older one.

PreenFM2 / Re: PC/Mac Editor version 2.00
« on: March 20, 2017, 10:38:23 AM »
I modified the links to have direct downloads  :)

PreenFM2 / Re: PC/Mac Editor version 2.00
« on: March 18, 2017, 09:39:10 PM »
The dropbox download link is broken. I think this has to do w/ Dropbox killing the public folders.

What do you see ?
I tried from an an anonymous session and i can download it.. Check the attached screenshot.
Do you have more information what the problem is ?

PreenFM2 / Re: Stm32F4Discovery port
« on: March 09, 2017, 09:49:28 PM »

Very nice  and totally unique :)
Thanks for sharing !!!

PreenFM2 / Re: preenFM is going to Eurorack
« on: March 09, 2017, 02:29:53 PM »
 Nice to see the 4 cv in  :)
Thanks for sharing....

PreenFM2 / Re: Issue with Encoder
« on: February 22, 2017, 08:49:42 AM »
Cool  :D
Thanks for the update.

PreenFM2 / Re: preenFM is going to Eurorack
« on: February 21, 2017, 09:05:02 AM »
I keep you informed.

Thanks  :D
Looking forward to see how it goes... and your modified front panel.

PreenFM2 / Re: preenFM is going to Eurorack
« on: February 20, 2017, 09:07:59 PM »
Is it possible to play notes via CV1-FQ and CV2-Gate (routed in matrix)?

No. I know this would be great.
Don't know when i'll find time to do that.


PreenFM2 / Re: preenFM is going to Eurorack
« on: February 19, 2017, 09:35:12 PM »
Thanks Lokki for the feedback and klangFM for the schema.
I forgot to push to github the correct Makefile.
It now compiles fine.

I attached the firmware of this adcIn branch.

For technical info,  a timer interuption and some DMA mechanism sample automatically the 4 analog pins.
It is done 4 times per block for each analog pins.
The final value is the average of those 4 samples to get rid of sample noise.
The final sampling rate is one value per 32 samples so arround 1200Hz. External oscillator as fast as 500Hz should work, wich leads to modulation much faster than the internal lfo.

I only tested with variable resistor pot plugged between 0v and 3.3v as analog source.
So let me know if some of you succed in using real analog hardware.


PreenFM2 / Re: Issue with Encoder
« on: February 19, 2017, 09:00:24 PM »

I attached a schema of the tracks you should follow for this encoder.
Double check and resolder (re-melt) those 6 points (green and orange) + GND point of the encoder (middle pin of the 3).

If it still does not work :
- check those connections from the solder point to the 74HC165 pins.
- try to swap the 2 74HC165 to verify one is not faulty.

Let me know,


PreenFM2 / Re: Issue with Encoder
« on: February 17, 2017, 01:48:08 PM »
Sorry i have a super limited internet access until next sunday.
Double check the soldering points of the 2 '9 pins network resistors'  just above the encoders.

PreenFM2 / Re: preenFM is going to Eurorack
« on: February 13, 2017, 12:03:42 AM »
I'm away from my computer still for 8 days.
Have a look at this post :

PreenFM2 / Re: Acrylic case online
« on: February 10, 2017, 05:26:22 PM »
A clean version is available on github :

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