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Messages - Xavier

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PreenFM2 / Re: Volume mixer
« on: March 03, 2018, 08:16:25 AM »

Did any try to use the performance page for that ?

In the matrix of each instrument you can try :
p1 -> 1.0 -> Mix*
p2 -> 1.0 -> Pan*

So when in the performance page, (part 5 here ) you can navigate through instrumuent by presing INST button and you always have the encoder 1 for the volume and encoder 2 for the pan.



You should ask Van Daal Electronics as i don't know exactly the reference.
But i assume that's good :)

This is the audio filter part, so you cannot break anything if that's wrong.

PreenFM2 / Re: priority bits
« on: February 02, 2018, 08:21:53 AM »

In the current design, the only important priority is the interuption that feeds the DAC from what i remember.

PreenFM2 / Re: LCD display connector
« on: February 02, 2018, 08:19:55 AM »
Have a look at the bom and at the LCD case in the github folder :

They all work fine together.

PreenFM2 / Re: How to create txt user waveform
« on: January 30, 2018, 10:37:22 PM »

As you must only keep 1 wave cycle, the pitch does not matter.

Yes the preenfm read the txt file and normalized the values.


Yes, all small caps can be soldered in both direction.
But watch the electrolytic caps minus pins !

Be carefull with the direction of resisor network (back 9 pins components), they're very difficul to remove once soldered.

Good luck  :)

PreenFM2 / Re: PreenFM2 r5d - midi DIN IN ok OUT not
« on: January 30, 2018, 09:04:00 PM »

Nice to read you have the In working.

The easiest way to try midi is to use the editor.
Read the small text here :
Binaries are here :

Modify editor should modify preenfm values : you test preenfm midi In.
Change preenfm2 value  and that should change editor value : you test midi Out.


PreenFM2 / Re: PreenFM2 r5d - new build midi not working
« on: January 28, 2018, 07:08:39 PM »


There are 2 things we don't see well on your picture :
. How the midi jack are solders.
. The direction of the 6N137

I attached a diagram with the connection you should check.
Same color = linked.

Happy debugging,


PreenFM2 / Re: PreenFM2 SMD version
« on: January 21, 2018, 02:25:26 PM »

Impressive soldering skills !!!  :o
Nice pictures....

PreenFM2 / Re: new matrix destination
« on: January 18, 2018, 10:00:35 PM »
You have RelC that modifies all "carrier" envelope releases and RelM that modify all "modulator" envelope releases.

I know i have to update the doc  ::)

PreenFM2 / Re: VolcaFM as development platform for PreenFM
« on: January 17, 2018, 08:54:13 AM »


Only the audio engine of the preenfm2 firmware could be used.
You'll have to rewrite the code for the surface control, the audio output, the storage, the display, the midi.

But i would love to see that :)


PreenFM2 / Re: Problem starting PreenFM2
« on: January 17, 2018, 08:47:10 AM »

I saw this for 2 different reasons :
. Bad display
. bad solder on the power pin

Check the second one.
Where did you buy it ? Mouser change without any problem OLED screen if you email them a picture.

PreenFM2 / Re: Problem starting PreenFM2
« on: January 14, 2018, 06:00:40 PM »
I do have an issue with the screen display.  Between lines two and line three there are lines above the characters.  Is this normal or do I possibly have a bad screen/ connection with the screen?

Yes, a picture of the display would help to understand what this can be.

PreenFM2 / Re: Problem starting PreenFM2
« on: January 09, 2018, 09:21:03 PM »
No, fat32 is fine.

PreenFM2 / Re: Problem starting PreenFM2
« on: January 09, 2018, 07:01:42 PM »
... and if the one i shipped does not work. I'll ship you a working one.

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