Recent Posts

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11
PreenFM2 / Re: PreenFM2 in recordings ;)
« Last post by Xavier on June 05, 2017, 11:02:33 AM »

Fantastic work..  8)
I just shared this on the facebook preenfm site. It has more visibility than this forum  ;)
Thanks a lot for sharing here.

Xavier
12
PreenFM2 / Re: PreenFM2 in recordings ;)
« Last post by kuzma_p on June 05, 2017, 10:30:26 AM »
Hello!

This 2XLP by me features a lot of PreenFM2. Also that '4 layers of PreenFM2' track ended up here and the last one is PreenFM2-only too.

https://soundcloud.com/gost-zvuk-records/gost008

It also features some retro UX/UI design by me



Cheers!
13
PreenFM2 / Re: Bought used preenfm2, usb not working properly
« Last post by Xavier on May 29, 2017, 08:42:38 PM »
Thanks for the tips Xavier. I will try to follow your tips and let you know. I do not know what CPU board I have and also the PCB revision! :) How can I discover? thanks and sorry for the "newbiness" ;)

Can you attach a picture of the whole PCB ?

The PCB revision is written on it : something like "R5d ".

For the CPU board this is the preenF405 :
http://ixox.fr/shop/img/p/30-70-thickbox.jpg
And this is the CERB40 :
http://shop.microframework.eu/Images/ProductOut/Thumb256/6575/0.jpg

And don't forget to upgrade your firmware. 2.07 is the latest revision and your preenfm2 will be much more powerfull with it than it is today with the 1.06.
http://ixox.fr/preenfm2/manual/upgrade-firmware/

Xavier
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PreenFM2 / Re: Bought used preenfm2, usb not working properly
« Last post by bhead on May 29, 2017, 08:37:06 PM »
Thanks for the tips Xavier. I will try to follow your tips and let you know. I do not know what CPU board I have and also the PCB revision! :) How can I discover? thanks and sorry for the "newbiness" ;)
15
PreenFM2 / Re: Bought used preenfm2, usb not working properly
« Last post by Xavier on May 28, 2017, 05:57:53 PM »
Hi,

What CPU board do you have? preenF405 or CERB40 ?
What is your PCB revision  ?

I would say you have a CERB40 with a faulty internal USB cable or without cable at all.
For more information about this cable, search for CERB40 in this page :
http://ixox.fr/preenfm2/build-it/the-pcb/

Best,

Xavier
16
PreenFM2 / Bought used preenfm2, usb not working properly
« Last post by bhead on May 27, 2017, 09:29:51 PM »
Hi everyone,

since I am no expert in assembling DIY kits I bought one used preenfm2.
I tried under MacOSX and Linux to attach it as an USB Mass storage device by pressing a key on boot and then pressing ENG but I do not see usb devices appearing.
Midi also doesn't work (I don't see the device), however the midi setting is set on Midi In/Out
So, the device is powered on but I cannot communicate with it via USB (midi or usb storage)

Do you think it is an hardware problem?

Firmware is 1.06
Bootloader is 1.11

Thanks in advance!

Cheers
17
PreenFM2 / Re: Yellow OLED : high frequency solution
« Last post by served on May 24, 2017, 12:38:39 PM »
Hi.

We have now had some time to test the noise issues.

Some remarks:
We have tested various inductors, to look for a low-noise unit that may have some better characteristics. No success in practice.

We have stopped producing and adding the metal sheet behind the screen. It shields the noise from the audio, but produces a new issue. Physical noise in the unit.

So the new Rev2 solution is a Aliuminium tape + coppertape with soldered cable and grounded + Plastic tape for isolation.
A Grounding cable will give you better shielding properties.

We are now basically following Xavier solution except added a GND cable.
18
PreenFM2 / Re: New firmware 2.07 (December 16th 2016)
« Last post by falfa on May 24, 2017, 12:22:21 AM »
Yay, new firmware, I missed it. Great, I love this :-)
19
PreenFM2 / Re: Output volume vs polyphony..
« Last post by opus.quatre on May 16, 2017, 09:53:06 AM »
Ah yes, ok.. And I guess I will have less aliasing when the polyphonique is reduced..
OK. . Thanx Xavier..
 Bonne journée. .
20
PreenFM2 / Re: Feature request?
« Last post by Xavier on May 16, 2017, 09:37:33 AM »
Hi,

Nice to read you enjoy your preenfm2  :)
I never know how to answer to question that begins by "is it possible"....
Do you ask (1) if it's possible, (2) if it's easy to do, or (3) if i would plan to do it ?

1 - Yes it's possible, the firmware is open source.
The midi to audio conversion is done here :
https://github.com/Ixox/preenfm2/blob/master/src/midi/MidiDecoder.cpp#L286
So you have to modify the code to introduce a delay at this point. Requires a little research to do that.
Then the timers for each instrument must be added somewhere in the settings.
2 - Not very easy
3 - No. It will add some complexity in the menus and settings that is not worth it to my opinion.

Possible Alternative : for the instrument you want to introduce a delay
. Set all mix* params to 0.00
. Set a matrix row like this : env2 1.0 mix*
. Then select the modulation : "Free Env 2" like this : "<D> 0.00 5.0 No"
Where <D> is the delay before your sound will begin.

Pseudo delay effect : can be done by
. using one LFO to pan the sound in the matrix (lfo1 1.0 pan*)
. And the gate target matrix (with an other LFO twice faster) to make the sound hearable only when right or left.

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