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Messages - Xavier

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PreenFM2 / Re: Trigger <randomize> with midi cc# ???
« on: January 18, 2019, 10:15:23 PM »

Not sure what you try to do.
Triggering a new random value when one midi CC# change ?
No that's not possible.
You can use some CC (1, 2, 115, 116, 117, 118) to control a matrix multiplier where the source is a LFO with a random shape.
I think that would be the closer solution.

PreenFM2 / Re: Volume mixer
« on: January 12, 2019, 11:37:56 AM »
Yes it's currently map on CC73.
I can include that in next release that makes sens.

In the meantime a hack is super easy if you can compile the firmware :

Code: [Select]
        case 7:just above or just bellow
Code: [Select]
        case CC_FILTER_GAIN:
Here :
Sending CC7 from 0 to 127 will set the gain from 0 to 1.27 in the filter gain parameter.

Keep in mind that's digital mixing so lower volume means lower bits resolution.


PreenFM2 / Re: resisitor network orientation?
« on: January 08, 2019, 10:57:33 AM »

With a LCD display you need the RV1 (variable resistor) to adjust the LCD contrast. Without it you have a black screen.
Do you see some backlight on the LCD when you switch on ?

You also need a USB key with the "pfm2/" folder on it. Else you'll have only white square on the LCD.
Without USB you can press a button while switching on and you'll enter bootloader mode, which will allow you to check the LCD.

In French / Re: ecran noir
« on: January 07, 2019, 10:00:07 PM »
Merci pour les dernières infos.
Tout fonctionne... bonne nouvelle !   :)

PreenFM2 / Re: resisitor network orientation?
« on: January 07, 2019, 01:39:34 PM »

That's a lot of information.
The 2.5v is the output of the DAC, so if not here it means the preenf405=>mcp4922 communication is not OK.

The 4 leds are connected in series to the same pin so it's weird one of them does not work. Polarity ?

Can you post a detailed good quality picture of your PCB, that would help.

Do you use an OLED or a LCD display ?
Double check the 68ohm LCD resitor if you use a LCD.
Double check the OLED resistor (22ohm if OLED and direct junction if LCD).

Do you hear a "pop" in the audio when you switch on the preenfm2.

PreenFM2 / Re: resisitor network orientation?
« on: January 04, 2019, 11:24:20 AM »
I just wanted to confirm that the square through hole is indeed the ground pin/common terminal for the network

OK i see. Yes it is !

You can easily check with a multimetre how your network is built.
10 K ohm between the common pin and any other one.
20 K ohm between any of other pins.

PreenFM2 / Re: resisitor network orientation?
« on: January 03, 2019, 05:29:07 PM »

Hi Ben,

16 10k resistors to replace the network, nice   ;)

Do you have the building doc ?
Search for "network" and you'll see the network resitor picture in place.

But i don't think a problem with the network can lead to a blank screen.
Don't hesitate with your questions, that's what this forum is for.


PreenFM2 / Re: Latest firmware : 2.09 (2018 October 28th)
« on: December 31, 2018, 12:59:52 PM »

I think i wanted to upgrade a long time ago to a more recent version, and it just didn't compile.
As it worked well with 4.7 i sticked with this release.

Also i updated the README to the latest 4.7 version which is the one i use today.


OK Thanks for the confirmation :)

Seems like the sysex is sent to rapidely or not at the speed the preenfm1 expects.
Can you add some delay between ?
I think i remember C6 from electron can do that.

In French / Re: ecran noir
« on: December 20, 2018, 09:54:57 AM »


Désolé, j'ai complètement loupé ton message.

As-tu résolu ton problème ?

Ca ressemble a un faux contact au niveau des points de soudure de l'écran.
La résistance "OLED" est-elle bien soudée ?


Hello there!

I recently got a second hand preenfm and i'm trying to upload these 128 patches. The only problem is that after the sysex file is sent the preen keeps showing "waiting sysex..." with a second line saying "Bank:0  ##-200". moving the encoders doesn't change anything, if i press menu again a message DONE appears but the patches are nowhere to be found.

Anybody can help?  :-[ i'm a total beginner in fm synthesis so having a few more presets would be great!

i'm running firmware 2.00

thank you  :-*

Oopss sorry i totally missed this message.
This is the preenfm1 forum and there atlmost no activity over here.
Can you confirm you have the preenfm1 and not the 2 ?

PreenFM2 / Re: PreenFM2 on stage!
« on: December 15, 2018, 04:10:52 PM »

I've been at the Olympa several times but in the crowd side ;)
Nice to see the preenfm2 here :)

PreenFM2 / Re: Latest firmware : 2.09 (2018 October 28th)
« on: December 12, 2018, 08:42:38 AM »

Maybe in some (rare) case having midi channel in combo would be usefull but i'm sure i'll have much more problems with people reporting it stops working because they don't send the midi channel of the combo.

Regarding the FLUSH it's used all the time by the plugin, so i think it works. The flush is done whatever the nrpn value is.
No it's not for USB only, should work with DIN5 midi.


PreenFM2 / Re: Yellow OLED : high frequency solution
« on: December 12, 2018, 08:35:14 AM »
EDITED : i thought it was a blue OLED. Seems like it's a yellow OLED in a blue metal box ;)


I have a blue OLED and it makes lots of noise (not the 13.5Khz noise though), unfortunately i don't have a solution for the blue OLED.
The only solution you have if you cannot modify the hardware is to have a look at the noise with a spectrum analyser and set an EQ to remove it.


PreenFM2 / Re: PreenFM2 on stage!
« on: November 26, 2018, 11:43:30 AM »
Hi Xavier, it's really as simple as what you can see on the picture attached. One master keyboard feeding PreenFM2 and Ambika, few pedals (delay and vibrato) and a Roland JD-Xi which is not on the picture, used only as a vocoder.

I'm combining both synths sounds most of the time it's quite lovely.

I don't see the picture you talk about.
Looking at the HTML source of you first post, i just saw you posted a JPG from dropbox.
But i assume it's not public and only visible to you when your dropbox session is open.

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