Messages

1231

preenfm2 and preenfm3 / Re: New Build Issues

« on: October 04, 2016, 10:48:25 PM »

I think the difference between the USB and the DC in is only because of the difference of voltage they provide.
USB is often a bit less than 4.8V.
On top of that USB often adds noise that reach the audio path...

Before trying the shield, make sure you solder a 22 ohm resistor in the "oled" resistor slot on the PCB.

XAvier

1232

preenfm2 and preenfm3 / Re: Folder support in patches

« on: October 03, 2016, 09:21:41 PM »

No there is not way to add folder structure.
You can copy up to 256 files (of 32 DX7 presets), other files will be ignored.
Then the preenfm sort them by alphabetical order.
While choosing your bank, use the 4 encoders. The one to the right will increase/decrease faster the bank number.

And once you have a nice sounding DX7 patch, don't forget to add a touch of stereo and use the randomizer, all set to "Keep" except 'modul' to add a bit of preenfm modulation 
Then save it under a preenfm bank to store the new sound.
The DX7 import is limited, and i think it's best used as a starting point to create more interesting sound.

Xavier

1233

preenfm2 and preenfm3 / Re: New Build Issues

« on: October 03, 2016, 09:05:29 PM »

Good to read you solve the OLED problem.

2.3. Can you insert a spectrum analyser (such as the free voxengo span) and let me know the frequency of the high pitch noise you hear.
If it's 15Khz, then you may want to add a shield such as explained in the oled mod thread. (No need to do the rest of the mod with PCB revision R5d if you inserted a 22R in the resistor slot called "OLED".)

When your use the USB AND a DC in power supply you have to remove the Jmp2 jumper. Is it your case ?
(removing Jmp2 prevent the USB 5V from arriving into the circuit as the DC in already provide currant).

The boot sound is a setting option, take a look at 3.1 here :
http://ixox.fr/preenfm2/manual/menu-mode/

Xavier

P.S. I don't know what images you tried to post but i cannot see them.

1234

preenfm2 and preenfm3 / Re: New Build Issues

« on: October 02, 2016, 09:19:46 AM »

Hi,

1. Seems like you have a soldering problem somewhere. Shortcut or missing point ?
You can start by follow the voltage verification in the reply #6 of this thread :
http://ixox.fr/forum/index.php?topic=63509.0

2. Can be your USB power supply. Some are very noisy. If the sound is always the same with different ones, can come from 1.

3. And not with USB ?
The preenfm2 audio is not balanced, so if your audio card expect balanced audio, the balanced cable can catch RF noise.

4. I forgot to add a little paper in the last kits i sent. On it is the URL of the manual and build instruction. In case you didn't find it :
http://ixox.fr/preenfm2/manual/synth-edit-mode/
For each of the 4 instruments, the polyphony is the number of voices you set. Set polyphony to 0 for instruments you don't use is a good best practice.

Let me know how it goes,
Best,

Xavier

1235

preenfm2 and preenfm3 / Re: A possible all in one synth ??

« on: October 01, 2016, 07:13:41 PM »

Hi,

1 ) For controller i think the midibox site is a good ressource to start :
http://www.ucapps.de/
Look at the controller project.

2/first 3) Midi is managed by what is called USART . Yes there are several USART available in the STM32F405 (MCU used by the preenfm2).
I don't have in mind if the other USART MCU pins are exposed through the preenF405.
You'll have to do a bit of research
It's not complicated to have the MCU listen to several USART at the same time. The midi part of the PCB will have to be doubled though (6N137 and the few resistors).

Second 3) I don't understand. Isn't you keyboard midi already ?
If not, go there : http://www.ucapps.de/midio128.html
If yes why do you want the preenfm2 to do that ? Cannot the keyboard send midi information ?

Xavier

1236

preenfm2 and preenfm3 / Re: Save/Load issue

« on: September 30, 2016, 03:03:32 PM »

The only folder you should see on your USB stick is "/pfm2/".
Everything is inside.
http://ixox.fr/preenfm2/manual/usb-drive/

If you skiped the "/pfm2/" folder, that can explain your problem.

Xavier

1237

preenfm2 and preenfm3 / Re: Save/Load issue

« on: September 30, 2016, 08:16:19 AM »

Hi Alex,

What USB stick do you use ?

Try to format it again, then copy back the /pfm2/* directory.
If that still does not work, try with another USB key.

Best,

Xavier

1238

preenfm2 and preenfm3 / Re: wooden case

« on: September 28, 2016, 09:31:53 PM »

Very very nice ! 

1239

preenfm2 and preenfm3 / Re: Stm32F4Discovery port

« on: September 24, 2016, 07:04:36 PM »

I just uploaded the preenF405 schematic here :
https://github.com/Ixox/preenFM2/tree/master/hardware/preenF405

I don't understand your "minimum system" question.


Best,

Xavier

1240

preenfm2 and preenfm3 / Re: Stm32F4Discovery port

« on: September 22, 2016, 08:44:38 AM »

You can start with the zip file from previous page.
It contains the bootlooder 1.11 (latest version) and an old firmware but that will allow you to setup and check your hardware.

I'll try to compile Norbim's latest firmware later.

Let us know how the build goes,

Xavier

1241

preenfm2 and preenfm3 / Re: Stm32F4Discovery port

« on: September 21, 2016, 10:11:03 PM »

Hi,

1) I'm almost sure the answer is yes, as there's not reason the low level display code has been changed.
And the preenfm2 works with regular LCD.

2) No. Norbim's firmware uses the DAC of the discovery and different pins for devices.
But i just noticed the firmware is regularly updated on https://github.com/norbim1/preenFM2
Nice job by the way

Xavier

1242

preenfm2 and preenfm3 / Re: envelopes: to click or not to click that is the question

« on: September 21, 2016, 09:58:50 PM »

is the fading time handled in env.h? (ca. line 190) i saw that you changed it in beta 2.05b3. and because there is a 6 in it i thought i ask i also changed the 6 to 2 and 1 and could not really hear a difference (with my monoponic patches)

Yes that's it.
I changed it from 8 to 6 while playing with your pure data patch as it minimised the number of ignored notes.
I remember having patches where i could hear the difference between 8 and 4.

1243

preenfm2 and preenfm3 / Re: envelopes: to click or not to click that is the question

« on: September 20, 2016, 10:58:37 PM »

No problem, that was a very interesting reading.

I didn't even know the name of that kind of clicks : "note stealing clicks".

> "Some japanese manufacturers (I don't say names here) prevent voice stealing clicks by fading out voices slowly before they start new notes. "

That's exactly what i do, during 6 * 32 samples, which add 5ms of latency when a note "steal" the voice of an other note.
The guy concludes it leads to "very bad MIDI timing".
I never heard anyone complaining about that.
But i think many would complain about the "stealing clicks" 

1244

preenfm2 and preenfm3 / Re: envelopes: to click or not to click that is the question

« on: September 19, 2016, 09:00:38 PM »

I'm not sure we talk about the same click.

Open timbre.cpp and replace the 2 occurences of  "noteOnWithoutPop" by "noteOn".
Load a soft sound with soft attack. Preen.bnk > 8-B Organ
Set number of voices to 2.
Now,  press A B C D E F G on your keyboard, without releasing any note.
At C and after, you'll hear the click.

I don't think this is something you want.

1245

preenfm2 and preenfm3 / Re: New firmware 2.05 (September 14th 2016)

« on: September 14, 2016, 10:45:00 PM »

2.05 is available for download. See first post.
It's worth upgrading