Messages

1891

preenfm2 and preenfm3 / Re: PCB Only/BOM problem reports

« on: January 03, 2014, 12:22:29 PM »

I don't read chinese so i cannot guess if what is written on the output schema is "clock wise" or "counter clock wise"
I think i remember somoene bought them for the PreenFM1, and the behaviour was a reverse behaviour.

Xavier

1892

preenfm2 and preenfm3 / Re: Help

« on: January 03, 2014, 12:14:36 PM »

OK thanks for the feedback.

2 possibilities :
1 . Your LCD does not work (i'll send you an other one if that's the case).
2 . You have bad connections between the CERB40 and your LCD.

Case 2 could be
.  a bad soldering connection: CERB40 DIN 40 socket, LCD connector on the PCB or connectors on the LCD.
.  or a problem with the PCB.
I'll upload tomorrow a picture with the connection you have to check.

After checking the connection if it still does not work, i'll send you an other LCD.

Xavier

1893

preenfm2 and preenfm3 / Re: Flashing the Bootloader in a Mac with Mavericks

« on: January 03, 2014, 12:10:24 PM »

Thanks 6581punk.
Yes it seems that installing dfu-util with brews is easier.

Varthdader, you don't need X-code to install a new firmware, and you should not have
And my documentation is not clear for OsX, you don't have to manually download dfu-util.
MacPorts or Brews will do it for you.

I haven't tried brews but from what i read :
The scipt to install is at the bottom of the brew page.
Open a terminal and copy and past :

Code: [Select]

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"Then

Code: [Select]

brew install dfu-util
The you should be able to run and dfu-util command.

Xavier

1894

preenfm2 and preenfm3 / Re: MIDI Sustain Pedal?

« on: January 01, 2014, 10:36:43 PM »

Aouch....
I could have guessed that.
Will fix that in next firmware.

Thanks a lot for your feedback,

Xavier

1895

preenfm2 and preenfm3 / Re: Question about USB

« on: January 01, 2014, 10:36:09 PM »

Thanks, happy new year to you too 

1896

preenfm2 and preenfm3 / Re: 115k resistors

« on: January 01, 2014, 04:30:08 PM »

Once you flash the bootloader and firmware is the internal USB cable needed? only the one I made didn't work.

Other than flashing firmware the Internal USB cable is needed to :
. have Midi over USB working
. seeing and managing your USB Stick from your computer (Bootloader 1.10+ needed)

Xavier

1897

preenfm2 and preenfm3 / Re: Question about USB

« on: January 01, 2014, 04:16:17 PM »

One more: should the USB stick be visible to the Mac or PC as a drive? It would be convenient to have it work this way so that I don't have to partially dissasemble the case to get the USB stick out.

Implemented in bootloader 1.10. 

Xavier

1898

preenfm2 and preenfm3 / FAQ

« on: January 01, 2014, 03:50:24 PM »

Why isn't <Awesome feature> supported ?
Can you add <Awesome feature> to the firmware ?

Let's discuss that on the forum.
But before, keep in mind that:
The preenfm firmware is open source and anyone with dev skills, can fork the git repo and make all the modification they want.
I'm always very happy to give code information and explain how things works.
For the official firmware i add what it think are the most valuable for majority of users, and also try to follow my vision of this synth.
(The amount of free time i have has also a big impact on that)


Where can i find FM documentation ?

Forum member "fori" recently post this list
http://ixox.fr/forum/index.php?topic=69815.msg75465#msg75465

Where are the last firmwares or other files to download

preenfm2 : http://ixox.fr/preenfm2/download/
                 https://github.com/Ixox/preenfm2/releases
preenfm3 : https://github.com/Ixox/preenfm3/releases

The encoders does not respond correctly

If you need 2 ticks to increase by one the value or if one tick increases by 2 the values, you need to change the encoder drivers.
In the menu (Menu > tools > set > "Rot. enc.") you can chose between 2 encoder drivers: 12 and 24.

How do i enter the bootloader

Press any key when turning on the preenfm2.
Press the menu key when turning on the preenfm3.



PREENFM3

SD card Error #-6# with the preenfm3

See this thread
http://ixox.fr/forum/index.php?topic=69819.0



PREENFM2

My display remains black when i turn on the preenfm2

Check that you removed the jumper JMP3, and turn it off and on again.

The Midi over USB does not work / The Led is not flashing on midi clock beat

Must be enable in the settings.

Can i access USB drive without opening my PreenFM2

Yes you need bootloader 1.10+
The PreenFM2 registers to your computer as a mass storage and redirect all low level access to the USB stick.
Don't expect high bandwidth, but it works :-)

What are P1, P2 and P3 for ?

. P1 allows you to plug a st-link v2 debugger.
. P2 extension port  (removed from PCB R5)
. P3 analog input. CV you need the adcIn branch of the github repository : https://github.com/Ixox/preenfm2/tree/adcIn

Except P1, none of them is useful today, and i cannot guarantee they will be useful someday.

TroubleShooting / It does not work

You can start by reading this thread :
http://ixox.fr/forum/index.php?topic=63509.0
And verify the different points shown of message #6.

1899

preenfm2 and preenfm3 / Re: Panning, Volume and some other things

« on: January 01, 2014, 02:26:24 PM »

Could you please make the panning go hard left and right? Gives a lot of extra possibilities. Like having 2 mono instruments on different mixer channels for example.

Yes, that what i'll do.

Shouldn't the pot be a log pot then? Even better would be to use a stereo pot directly on the outputs.

Yes the solution i chose for the volume is not the best one.
I searched but I haven't found a cheap easy to find stereo pot... do you know one ?

Xavier

1900

preenfm2 and preenfm3 / Re: 115k resistors

« on: December 31, 2013, 10:38:35 AM »

You should go for 1% tolerance resistors for the filter : 1.8K, 8.2K, 115K. (220 and 10K are much less value sensitive).
1.8K & 8.2K define with some capacitors the cutoff frequency of the antialiasing filter.. So you don't want it to be too low not to remove high frequencies. It's set at 20Khz.
The 115K adds a 6 bits dac output to the other DAC that comes from the 1.8K, so you want 115K/1.8K to be as close as possible to 64 (2^6). So that your 18 bits DAC is as linear as possible.
120/1.8 = 66.6... Should work.
I would go for 120K. Buy several and select the 2 that are closer to 115K. 

Xavier

1901

preenfm2 and preenfm3 / Re: Panning, Volume and some other things

« on: December 31, 2013, 12:07:50 AM »

oh last thing had to do with usb midi in out setting. I was maybe controlling the parameters of instrument 1 via a loop in my computer (?).

Is your instrument 1 listening to ALL midi channel ?

Or maybe your sequencer redirected all channel to channel 1.

1902

preenfm2 and preenfm3 / Re: Panning, Volume and some other things

« on: December 31, 2013, 12:06:57 AM »

oh last thing had to do with usb midi in out setting. I was maybe controlling the parameters of instrument 1 via a loop in my computer (?).

Is your instrument 1 listening to ALL midi channel ?

1903

preenfm2 and preenfm3 / Re: Panning, Volume and some other things

« on: December 31, 2013, 12:03:24 AM »

1. Yes by design, but i may change that.
2. I have no control on this. The pot directly change all the DACs reference voltage. It's not digital.
3. Yes we can hear something strange at low level when we turn up the headphone amp up. Not sure what it is. MCP4922 DAC effect ?

oh and another really strange thing is that i'm always editing the parameters of all 4 instruments at once.....

All instrument at once ? Someone already reported this...  And i don't know at all how this can happen.
Do you have midi Thru enable on the PreenFM ? Can that be a midi loop between your sequencer and the PreenFM ?
Do your 4 instrumens listen to different midi channel ?

Let me know if you have more information,

Xavier

1904

preenfm2 and preenfm3 / Re: PCB Only/BOM problem reports

« on: December 30, 2013, 11:31:44 PM »

20 dents encoders should work if it uses the same quadrature output table as :
http://www.bourns.com/data/global/pdfs/pec11r.pdf
What model do you have ?

1n4004 can replace 1n4001.

Xavier

1905

preenfm2 and preenfm3 / Re: MIDI Sustain Pedal?

« on: December 30, 2013, 11:30:39 PM »

It's implemented in the last beta firmware :

Copy from other thread :
" https://dl.dropboxusercontent.com/u/41654198/preenfm2/firmwares/pfm2_0.9m.zip
I just finished it and not tested enough to release it, but it contains a big rework and lots of fix regarding usb/midi/sysex."

Let me know if it works.

Xavier