1411
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 16, 2015, 10:34:19 PM »
I meant : "Power it up WHILE pressing a button."
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1412
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 16, 2015, 10:28:50 PM »
Last test of the day :
Power it up by pressing a button.
Check on the display you are in bootloader mod.
Then check one more time the 2.5v. Still 0v ?
Power it up by pressing a button.
Check on the display you are in bootloader mod.
Then check one more time the 2.5v. Still 0v ?
1413
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 16, 2015, 10:18:18 PM »The 2.5v on VCC is regulated internally on the DACs?
No, this is the zero of the preenF405 audio output signal. It sends 2048 on the 4096 DAC range.
So another test, put back the opamp, remove the preenF405 and test the 2.5v points. You should get 0v.
1414
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 16, 2015, 10:07:06 PM »
Have you tried to swap the preenF405 with an other one one ?
1415
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 16, 2015, 09:12:28 PM »
I worry about the 4.02v.
That should really be VCC/2. So 2.5 if you get 5v on VCC or 2.4 if your USB power is 4.8.
Seems like there is something wrong in the audio path after the DACs.
Please, follow the following picture.
Remove your op amp, and try to connect directly with a metal wire the 2 blue points (or the 2 green points).
Do you hear something when you play midi notes while the note are connected ?
That should really be VCC/2. So 2.5 if you get 5v on VCC or 2.4 if your USB power is 4.8.
Seems like there is something wrong in the audio path after the DACs.
Please, follow the following picture.
Remove your op amp, and try to connect directly with a metal wire the 2 blue points (or the 2 green points).
Do you hear something when you play midi notes while the note are connected ?
1416
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 15, 2015, 09:35:48 PM »I attached 2 pictures.
1. First you can check all 5v, ground and 2.5v voltage. (2.5v only if the preenfm2 is powered 0v otherwise).
2. on the other picture, I colored the wires that the preenF405 uses to send audio samples to the DACs. Check the solder points and the connections (null resistor).
Xavier
1417
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 15, 2015, 10:32:45 AM »The pop you hear is the empty audio signal around the op amp reaching 2.5v.
As you have both audio channels not working, it must be the connection between the preenF405 and the DACs.
I'll be back tonight with some aditional testing you could do.
Xavier
1418
preenfm2 and preenfm3 / Re: My first preenFM2 metal case built from kit #1 of 3 .. trouble shooting no audio
« on: September 15, 2015, 09:20:22 AM »
I don't see any obvious error and everything looks nice (although a bit too much soldering 
)
How do you test audio ?
Do you see a note blinking on the display when you send midi notes ?
Have you tried holding down "MENU" button and press one of the five left buttons ?
What happens then ?
)How do you test audio ?
Do you see a note blinking on the display when you send midi notes ?
Have you tried holding down "MENU" button and press one of the five left buttons ?
What happens then ?
1419
preenfm2 and preenfm3 / Re: PreenFM2 More Waveforms Like the Ableton Live Operator?
« on: September 15, 2015, 09:17:00 AM »
I also like the idea of loading waveform from the USB.
The problem is preset compatibility between preenFM.
But that can be fun.
I try to make a new feature with each new Kits batch.
This one could be for next run
The problem is preset compatibility between preenFM.
But that can be fun.
I try to make a new feature with each new Kits batch.
This one could be for next run
1420
preenfm2 and preenfm3 / Re: PreenFM2 More Waveforms Like the Ableton Live Operator?
« on: September 14, 2015, 09:25:21 AM »
You'll notice that in firmware 2.00 some waveforms are not anymore in CCM (quick) RAM, and it works fine.
So add your waveforms at the bottom of "waves.c" without
__attribute__ ((section(".ccm")))
And you should be able to add a few.
My only remarks is that i'm not sure about adding complex waveform in a FM synthesis.
Hmm.. Maybe for the carrier operators...
If you create interesting patch with this don't hesitate to share
Xavier
So add your waveforms at the bottom of "waves.c" without
__attribute__ ((section(".ccm")))
And you should be able to add a few.
My only remarks is that i'm not sure about adding complex waveform in a FM synthesis.
Hmm.. Maybe for the carrier operators...
If you create interesting patch with this don't hesitate to share
Xavier
1421
preenfm2 and preenfm3 / Re: New beta firmware 2.00 beta 1 (August 28th)
« on: September 11, 2015, 10:55:18 PM »Hi Julien,
Thanks for the feedback.
That's because one encoder step is 0.01 and after 10.0 values show up with only 1 digit after the comma which makes 10 encoder steps for one display step.
Turning the encoder modify the internal value even if the display does not reflect that.
Same problem with envelope time values.
I agree it would be more comfortable if the encoder step become 0.1 for value bigger than 10.
Xavier
1422
preenfm2 and preenfm3 / Re: preenfm2, what is an affordable input device?
« on: September 08, 2015, 10:14:30 PM »Hi Randolf,
That's a little strange to start a home studio with a Kit of a FM sound module
As clémént said you can use the midi editor of a sequencer program.
Tracktion 4 is free, give it a try :
http://www.tracktion.com/
Chosing a midi keyboard is not easy. For the first one i would take a cheap one such as alesis Q25.
If you take a keyboard with mini keys, i think you won't get MIDI jack output (only usb), so you'll need a computer between the preenfm and your keyboard.
Where will you plug the audio output of the preenfm2 ?
Mixer ? Sound card ?
Xavier
1423
preenfm2 and preenfm3 / Re: New beta firmware 2.00 beta 1 (August 28th)
« on: September 04, 2015, 10:32:36 AM »
Great.
Thanks for the feedback norbim1 and kuzma_p.
Thanks for the feedback norbim1 and kuzma_p.
1424
preenfm2 and preenfm3 / Re: New beta firmware 2.00 beta 1 (August 28th)
« on: September 04, 2015, 09:25:33 AM »Small sacrifice for such an increase in functionality!
Thanks
BTW, I'm curious about the bitcrusher; is it using dithering at the low settings?
preenFM2 FX are very simple.
The code is opensource and the FX are in Timbre.cpp in fxAfterBlock function.
The Bitcrusher algo is this one :
http://www.musicdsp.org/archive.php?classid=4#139
No dithering, no interpolation...
Xavier
1425
preenfm2 and preenfm3 / Re: New beta firmware 2.00 beta 1 (August 28th)
« on: September 04, 2015, 09:19:09 AM »Hi,
I upgraded my Discovery port with the new poly firmware, and it definitely sounds better then before! It's a Huge step I think. As I tested it, I noticed a small difference in an organ voice. I think, that the difference related to OP envelope. If I set both the sustain and release levels to zero, the release time has some effect on the sound, but I think it shouldn't have to be. Maybe it is a bug in my port, can somebody please check this on an original PreenFM2 hardware?
Thanks, Norbim
That's interesting i modified slightly the enveloppes.
If the bootloader works on your the discovery port, it's very easy to change the firmware using the "flash from USB" option. "OP" button in the bootloader
Put both firmware (1.06 and 2.0b1) on the USB drive and you can switch from one to the other in 10 seconds.
Or can you save your patch in the default combo : SAVE>DEFL>SAVE.
Use the bootloader to access the default combo on your USB drive (ENG button) its "pfm2/DFLTCMBO.pfm".
Attach your patch in this thread. I'll give it a try.
Thanks