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Messages - Xavier

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1
preenfm2 and preenfm3 / Re: PreenFM3 has operator feedback?
« on: February 23, 2021, 08:50:27 AM »
Would it be possible to implement algorithms with the feedback spread across multiple operators like it is in algorithms 4 and 6 on the DX7? (See the image below; sorry for the large image.) I feel like those algorithms are where the feedback gives you something different than, say, having a saw wave as your modulator.

The current implementation allows only the first operators (with no operator above) to have a feedback. (It's a phase modulation feedback in a frequency modulation synth)
Changing anything regarding the feedback is not on my list.
The firmware is open source and if anyone wants to improve it, i'll help.
I added the feedback to the preenfm3 because many people asked for it, but to my opinion it's 0.01% of the sonic possibility of the preenfm3 ;)

2
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 22, 2021, 09:42:06 PM »
Thanks a lot for the feedback i kept the first list.

Here is the 2.20u firmware for those who wants to try to this new unison :)
https://drive.google.com/file/d/1JvdvFUr3iiqil1mkbZKQsNctCgQVKetz/view?usp=sharing

The instrument stops playing now if you change the number of voice while playing unison, to make sure following played note is OK.

Reminder :
Unison detune is now [-1 : +1].
Negative value set the same phase for all voices.
Positive values set a different phase.
I find that preenfm unison sounds best with 3 or 4 voices...

3
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 22, 2021, 07:03:03 PM »

I made a .125f difference between voice 1 and 3 (so that the 45° is between left and right when using 3 voices).
 and tried to keep primary numbers for others.
Let me know if  { .37f, .11f, .495f, .53f, .03f, .19f, .89f, 0.23f, .71f, .19f, .31f, .43f, .59f, .97f };
sounds the same as yours.

4
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 22, 2021, 06:52:44 PM »
Then I shifted the 2nd and 3rd unison voice to .125f and .25f and it makes an improvement.

Shifted ? or replaced ?
Can you let me know your float array ?

5
preenfm2 and preenfm3 / Re: PreenFM3 has operator feedback?
« on: February 22, 2021, 06:50:22 PM »

Yes it has been added in firmware v0.91 last october.
https://github.com/Ixox/preenfm3/releases/tag/v0.91

7
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 22, 2021, 05:34:32 PM »
Aouch, cannot try right now.
But it seems i made a typo while refactoring a small part :
https://github.com/Ixox/preenfm2/blob/Unison/src/synth/Timbre.cpp#L559
Can you try to replace != by =  ::)

8
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 22, 2021, 11:10:30 AM »
Great discussion! Will you remerge the stuff to pfm3 (phase offset etc.)

Yes :)

9
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 22, 2021, 09:32:09 AM »
If you have any values that work better than the ones i set, i'll happily change them.

Those values are multiplied by the size of the waveform to set the starting sample to use.
0.0f : first sample
1.0f : last sample
0.5f middle sample etc.

so if you want 90 degree between 2 voices they must have a difference of 0.25f.
45 degree difference : 0.125f

There are 14 values because there are 14 voices at maximum.
So yes first values is for voice 1, second for voice 2 etc...
I agree that the 3 first values are the more important, as i don't detect any big improvement with the current algo for high number of voices.

Let me know what you find, thanks for your help !

10
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 21, 2021, 09:29:21 AM »
Here is the next beta Unison firmware for the preenfm2  2.20u
https://drive.google.com/file/d/104UNZ-R6j8ukwVbELv4xVnOZ2ii47ixH/view?usp=sharing

. CV/Eurorack should work much better :)
  I can still hear some weird random glitch in the sound. Not sure what it is (maybe the CV i send ?). Still have to investigate.

. Now the Unison Detune is between -1.0 and +1.0.
  With positive detune there is a different starting phase for each voices of the unison
  With negative number phases are all the same (as in 2.20t).
  The difference is not huge but i had the feeling in my quick tests that different phases sound a bit better specially with bigger detune value.

11

Wow !
beautifull case  :)
Thanks for sharing !

12
preenfm2 and preenfm3 / preen FM2 headphones 3.5 mod
« on: February 18, 2021, 09:22:57 AM »
Luckily, I have the R6.2!
By shorting the jumpers, do you mean bridging the three tiny pads labeled "1", "2", and "Aux_5v" or something else? Sorry, I'm such a newbie   :D

Yes that' it  :) Be carefull they're tiny.

Technically, the Aux output is behind an op amp that i didn't want to wire by default.
Aux_5V will power the op amp.
"1" and "2" will feed it with the audio output.
then you can use the "Aux 1 2" 3 pins. The one below "Aux" is the ground, the 2 other ones are the audio outputs.
You can plug an headphone here, but keep in mind that there's no headset amplifier and the level will not be very high.



13
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 18, 2021, 09:02:45 AM »
Thanks for the feedback.
I need to try with the Eurorack version but that won't be before this week end.

I don't want to add any new parameters in the UI.
I'll see if i can add randomness somewhere to mitigate the phasing effect.

14
preenfm2 and preenfm3 / Re: preen FM2 headphones 3.5 mod
« on: February 18, 2021, 08:55:36 AM »
If I'm using the R6, would it be the same configuration?

Unfortunately it depends on the R6 version. R6.1 ? R6.2 ? R6.3 ?
R6.1 : The traces are different. There's nothing you can do. Sorry about that  :-\
R6.2 : Same audio wiring as R6.1 but you can use the Aux output as a secondary output and wire a jack there, after shorting the 3 "Aux" jumpers.
R6.3 : nothing to do, the stereo mode is already in place for the main jacks. (The secondary output "Aux" can also be used).

15
preenfm2 and preenfm3 / Re: Pfm2 : unison discussion
« on: February 17, 2021, 09:36:58 PM »
Here is a link of a compiled version for those who wants to give a try :
https://drive.google.com/file/d/1IGHz_fjZTfmmGBk1qzq7rgYY6UQ9ADMG/view?usp=sharing

It's called 2.20t, not sure yet if that will be 2.21 or not.
CV/Eurorack version is not tested at all, as i don't have any Eurorack where i am for the week.

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