Messages

1876

preenfm2 and preenfm3 / Re: Best FM programming book or guide?

« on: January 10, 2014, 09:35:46 AM »

Hi 6581punk,

Copy and past for an Old PreenFM1 thread.
It's still valid, should copy that in the FAQ ;-)

"Why not starting by a video  ?
http://www.youtube.com/watch?v=h3yrd2YvkUo

Then, I would suggest this reading :
http://noisesculpture.com/how-to-make-a-noise-frequency-modulation-synthesis
1,5 Euros for the Kindle version...

This link is intersting too:
http://www.soundonsound.com/sos/apr00/articles/synthsecrets.htm

In this one you need to adapt the example to the PreenFM but is worth reading:
http://the-all.org/tx81z/fm_overview.html

To practice with the PreenFM you can start with AlG1 with IM2 = 0 and IM3 = 0.
Just play with OP1 and OP2 and IM1.
Start modifying the OSC and the enveloppe and try to understand what's happening...
Remember that OP1 is the carrier (the one that create the sound)... and OP2 a "modulator", it affects the spectrum...
Start slowly to add a LFO in the Matrix.
Continue step by step."

Xavier

1877

preenfm2 and preenfm3 / Re: TubBells DX7 Patch demo

« on: January 07, 2014, 11:52:27 AM »

Heter project goes rather far in the DX7 emulation :
http://dssi.sourceforge.net/hexter.html

Not sure yamaha cares about all those project ;-)

I also read that people used odd settings (but inaudible ones) as a sort of watermark so they knew if their patches were being copied.

Interesting... that can explain the strange values i see with some high level modulation oscillator.
The problem is that some of them creates VERY audible aliasing/noise on the PreenFM.

1878

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

« on: January 07, 2014, 11:47:00 AM »

Thanks Samuel for jumping in and for the information 

1879

preenfm2 and preenfm3 / Re: PreenFM2 USB issues.. (Windows 7 / 64bit)

« on: January 07, 2014, 11:45:51 AM »

Yes the usb cable is the most sensitive part to build.
I would love a CERB40 with 2 aditional pins instead of the mini usb connector.

Thanks for the feedback, i'll add the D+, D- information somewhere.

Xavier

1880

preenfm2 and preenfm3 / Re: Display doesnt work

« on: January 07, 2014, 11:44:19 AM »

Aouch... 

Here is a LCD wiring schema.

green = GND
red = 5V
dark grey/blue = variable resistor output, LCD contrast

I think what you think is #12 is actually #13.

Xavier

1881

preenfm2 and preenfm3 / Re: TubBells DX7 Patch demo

« on: January 05, 2014, 11:25:10 PM »

I had to implement all DX7 algos to be able to read the preset. PreenFM algo from 10 to 27 are the same as the 32 DX7 algos.
DX7 algos can be different only because of the place of the feedback (See attached picture).
As the PreenFM2 does'nt have feedback it needs less algo. High feedback value can be simulated by selecting a different waveform of the operator.

What i'll try to do is to have the presets sounding better (not closer the DX7), at least by removing the digital noise that occure in too many presets...

Bad sounding DX7 preset can often be solved by manually decreasing modulation indexes and frequency of the oscilators in the highest positioned operator. Press ENG + MENU to have a quick look at the algo. Operator 5 & 6 are often guilty.
Reseting "fine tune" in the oscillator can also help.

Keep in mind that many presets use corner case or even bug of the DX7 to sound as they do. I learnt that by studying Hexter code (http://dssi.sourceforge.net/hexter.html)
The PreenFM2 will never be able to emulate that

Xavier

1882

preenfm2 and preenfm3 / Re: MIDI Sustain Pedal?

« on: January 05, 2014, 02:11:45 PM »

I hope it's OK now in 0.9o.

Xavier

1883

preenfm2 and preenfm3 / Re: Color Tests

« on: January 04, 2014, 09:05:41 PM »

Nice and interesting thread... thanks a lot for sharing :-)
I like a lot the rainbow ones... unique !

Xavier

1884

preenfm2 and preenfm3 / Re: Help

« on: January 04, 2014, 12:18:26 PM »

Hi Tenchi,

Here are all the LCD connections.
Please check them all.

(Sorry i changed the color signification since last picture).
Check green point are linked together and to the ground.
Check red ones are 5V.
And that the grey/blue one (LCD pin 3) change when you turn the variable contrast resistor.

Then your multimeter into shortcut detector.
Check every orange connection from the CERB40 pins to the LCD pins on the other side.

And let me know the result,

Xavier

1885

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

« on: January 04, 2014, 10:49:15 AM »

Yep - success! Worked for me too. After installing Xcode 3.2.6 and fiddling with the commands it finally worked. Thanks! :-)

Great.. 
Thanks for the feedback... I have no idea why xcode is required.
Do you remember the result of "dfu-util -l" before installing xcode ?

1886

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

« on: January 03, 2014, 06:33:18 PM »

Oh yeah !!!!! 

1887

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

« on: January 03, 2014, 06:22:42 PM »

Congrats it's done 

To enter bootloader, you must press one of the button while powering on the PreenFM.
Release the button when you see "BootLoader v1.10" on the LCD.
You have then several  choices :

1. Press "Eng"  and your USB stick will appear on your computer after a couple of second.
You can then copy the future firmware on the USB stick that way (copy them in the '/pfm2/' firmware).

2. Press 'Op' and you can select one of the firmware from the USB stick to flash.

So you won't have never agin to fight with dfu-util :-)


Xavier

1888

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

« on: January 03, 2014, 05:59:03 PM »

The link to the last firmware is at the top right of this page.
Direct download to the last firmware :
https://dl.dropboxusercontent.com/u/41654198/preenfm2/firmwares/pfm2_0.9n.zip
Unzip the file.

In the terminal, move to the directory where you extracted the files (using cd command).
Run the dfu-util commands from this directory.

Xavier

1889

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

« on: January 03, 2014, 05:45:00 PM »

Good... One step furhter ;-)

When your PreenFM is visible in DFU mode with 'dfu-util -l'
You just have to copy and past the content of the cmd iles in your terminal.

Or copy the following :

Code: [Select]

dfu-util -a0 -d 0x0483:0xdf11 -D p2_boot_1.10.bin -R -s 0x8000000for the bootloader...

And :

Code: [Select]

dfu-util -a0 -d 0x0483:0xdf11 -D p2_09no.bin -R -s 0x8040000for the firmware.

Xavier

1890

preenfm2 and preenfm3 / Re: Help

« on: January 03, 2014, 03:25:00 PM »

Also, did you remove JMP3?
Once flashed you remove that jumper so it boots as normal.

Yes, he did that right, he has the midi and audio working.
That really is a LCD problem only now.

Xavier