Recent Posts

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PreenFM2 / Re: Can't save to usb
« Last post by kx3 on May 14, 2017, 12:19:44 AM »
Save-Syx-Send Patch = message "Done" appears.

If 1- Midi OX waiting for Sysex. Midi port set to PreenFm2. Nothing happens.
If 2-Midi OX waiting for Sysex. Midi port set to "anything on wich Preen is connected via DIN5".  Dump succesfully received.

If I repeatedly dump the single sysex patch, once in a while it shows in the input monitor.
It looks like corrupted message is received (like no status byte is received as nothing is shown in the monitor)

Problem occurs only via USB port when sysex is involved. With standard message (upon reception) USB port works just fine.
I tried with different buffer size with no success.
PreenFM2 / A higher polyphony ??
« Last post by opus.quatre on May 13, 2017, 10:33:10 PM »
Hello there.. And most of all, hello Xavier.. Because this message is mainly for you..

Let's say that the subject will be : would it be possible to make a version of PreenFM2, with a bigger polyphony, by using a pair of Preenf405, one would be the master, and the other would simply be the slave ??

I know that the PCB is not made for it.. But we can probably imagine that, instead of placing the Preenf405 board in the IC support, we could use headers, and connect a second PCB which would hold both Preens..

My old Ensoniq ESQ'1 has a "overflow" option, in its MIDI menu, which allows driving a second ESQ'1 (or a ESQ'M expander) when the number of midi notes received, exceeds it's own polyphony (8 notes)..

The master Preen would then have to send exceeding notes to the slave, and performance control like pitch bend, mod wheel etc.. In fact a full bunch of incoming midi messages.. But not only ; it would also have to send all the preset (or combo) parameters, so that both play the same preset or combo..
The slave would be totally hidden, the user would not have access to it : it would only be there to obey to the master..

Each preset or combo that we would save in the master, would be saved identically in the slave's memory, same preset or combo number..

In terms of price, what would it cost ? Of course, an added PCB, and a second Preen.. What else should be doubled ?
What else should be added ?? I think that there would need a mixer.. Possibly digital mixer, or analog, but prior to the final stage, so that we can use the volume knob to set the volume of the mix..

I know, Xavier, that your time is not infinite.. You have a life to live, and you once said that you would like to have time to play your music.. I understand this very well, and I can just approve you..
And in fact, except me, I don't know how many people would be interested in having a more polyphonic version..
I'm just wishing that I could have a "wider" preenFM, (mainly for electric pianos, in fact) and by this message, I'm opening the topic, for discussion.. But if you say "no way", or "no time", or "too complicated", and even "useless when it concerns only you", then I would fully understand and abandon my wish..

Have a good week end..

PreenFM2 / Re: New slippers -> no USB
« Last post by opus.quatre on May 12, 2017, 08:59:37 PM »
Oh.. I see.. Ok, it works.. Thanx Big Secret..
PreenFM2 / Re: Stm32F4Discovery port
« Last post by norbim1 on May 12, 2017, 02:04:39 PM »
Hi electron libre,

I think it can be a problem with the USB stick or the power line to it ....

by further analyzing the code I realized that the USB_FS_Core is responsible for the computer connection side, so You should check the PC USB connection instead. It can also be a USB power issue.
PreenFM2 / Re: New slippers -> no USB
« Last post by bigsecret on May 12, 2017, 12:57:16 AM »
Yes there is a parameter to set

Read part 3 here :

Failing that it's down to checking the joints etc
PreenFM2 / Re: New slippers -> no USB
« Last post by opus.quatre on May 11, 2017, 07:33:21 PM »
"Preen is once again visible as a connected device on my PC  :D"

oh.. This makes me remark that my own PreenFM is not visible as a device.. Has never been, in fact.. Did I miss something when building it ?? Is there a parameter to set up, somewhere ?
PreenFM2 / Re: Z-plane/Morph filter
« Last post by opus.quatre on May 11, 2017, 07:22:29 PM »
I arrive after the battle..
Just reading this topic, I thought..
Well, as long as one wants to use 2 sounds, and morph them at different ratio, the matrix can be the tool..
By selecting one modulation source, let's say the mod wheel, on both of the presets.. And the destination would be, on each of those presets, "all mixes" etc.. But the multiplier would be +10 on one preset, and -10 on the other preset..
Then you could use the mod wheel to morph from one preset to the other..

But another source could be selected, like after touch, velocity, breath controller..
But sure, you already had figured it out..

Have a nice evening..
PreenFM2 / Re: Connecting..
« Last post by opus.quatre on May 11, 2017, 07:00:13 PM »
Désolé, Xavier, pour mon retard à te lire et à te répondre.. ET merci pour le temps que tu consacres à mon (petit) problème..
Maybe I didn't say that my PreenFM2 works correctly when powered by USB..
It simply doesn't work ONLY when I power it through the 9V entry..

"Is the LCD brighter when you switch on the preenfm ?"
Not sure I understand the question.. Brighter than what ? Brighter than when switched off, of course..
When I plug the 9V, the blue leds will be "on" for one or 2 seconds.. Unstable,  but on.. The LCD will be lit; or say bright, for the same amount of time.. But nothing appears on the LCD.. No welcome message or whatever.. and the 7805 will start heating the room..
That's why I ususally don't stay more than 5seconds..
Then I unplug it.. And if I immediately plug the 9V again, then nothing happens.. No blue led, no bright LCD..

And I don't know where is my multimeter, so I can't check anything for now.. I will, when I find it back..

But when plugged and powered through USB, everything works perfect..
PreenFM2 / Re: Stm32F4Discovery port
« Last post by Xavier on May 11, 2017, 03:45:36 PM »
Hi Xavier!

Thanks for the tip. I just checked the symbol list, and found, that at 08041AC0 there is the OTG_FS IRQ handler, and thought that the 0x28041AC0 dumped PC value can be the same with a memory mapping offset. I'll try to find it with gdb, though I only used it before to debug a connected target.

Yes RAM adress in the STM32F4 is 0x20000000. So this is the same adress moved into MCU RAM !
PreenFM2 / Re: Harsh noise at 13,5kHz from preenFM2
« Last post by Xavier on May 11, 2017, 03:40:37 PM »

Yes this come from the yellow OLED display.
Verify your PCB version and read carefully this :

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