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PreenFM2 / Re: PreenFM Eurorack module
« Last post by aze_007 on December 01, 2019, 10:10:44 PM »
This value is at 50%. I did not try to change it. What does 0% or 100% mean? Does it change the way the voltage is read from the CV input?

Otherwise I did not do anything particular. I loaded different sounds from the USB stick which was included. They load fine. With MIDI I can play a sequence with the loaded instrument. If I connect CV and Gate from the same sequencer nothing happens at all. These voltages work on other VCO‘s and EG‘s so no Problem on that side.

I have tried changing in the settings menu CV instrument from 1 to the other three choices, no difference.

Anything else I can try!

Thanks for your help.
Alexander
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PreenFM2 / Re: start phase of an operator
« Last post by Xavier on December 01, 2019, 06:28:27 PM »

Still a bit confusing  :o
But if what you're after is to modulate the starting phase of operator wave, you won't have that.
Modifying the pitch/frequency of each operator can be done in the matrix. But i think you know that ;)
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PreenFM2 / Re: operator feedback
« Last post by Xavier on December 01, 2019, 05:59:12 PM »

The pitch shifting could be avoided with a High pass filter. As it's already implemented when 3 or more operators are in cascade.

Yes, that would be interesting to add new ALGO with some feedback capability.
ALGO1 is here, if anyone want to modify some wirings :
https://github.com/Ixox/preenfm2/blob/master/src/synth/Voice.cpp?ts=4#L314
Line 350 is the HP filter for OP2.
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PreenFM2 / Re: start phase of an operator
« Last post by matrix12x on December 01, 2019, 05:52:25 PM »
Thank you.

I could be clearer on my second sentence.

Let's assume two sin waves are at the same phase, 𝜙0, at 𝑡=0  and you change the frequency of one of them at exactly that time, for example by 1 HZ, my understanding is that the phase difference between them is a function of time and the difference between the two frequencies. 𝜓(𝑡)=𝜙1(𝑡)−𝜙2(𝑡)=2𝜋(𝑓1−𝑓2)𝑡

So, I had wanted to sort of fake PWM by overlaying two saw waves, one positive, one negative at different phases to make a pulse wave when the two waveforms are offset at like 90 degrees (a 25% pulse wave) or more. And I was thinking that using a pitch envelope to modulate the pitch of the second operator to make a pseudo PWM.
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PreenFM2 / Re: operator feedback
« Last post by matrix12x on December 01, 2019, 05:37:47 PM »
I don't think its a CPU/polyphony issue.

The PreenFM2 does FM. Operator feedback in FM changes the pitch of the sound. I recommend using other waveforms to get the sound you want. For example, when I want to simulate an operator feedback sound I use the saw waveform. It works really well for the types of sounds I'm doing. There are also some user waveforms on the forum with varying amounts of feedback.

The Yamaha DX series actually uses Phase Modulation.

However, along these lines, what might be cool would be having for example, a new algorithm, something like Algorithm 1, but have a modulation index (IM4) to allow OP1 modulate OP2.
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PreenFM2 / Re: PreenFM Eurorack module
« Last post by Xavier on December 01, 2019, 05:35:47 PM »

Hi,
It's hard to reply without knowing more what you're doing.
Have you tried turning down the CV Gate in "MENU>Tools>Set>CV GATE %" ?
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PreenFM2 / Re: start phase of an operator
« Last post by Xavier on December 01, 2019, 05:33:04 PM »

The starting phase of operators cannot be modulated.
It is set to a quarter of the period, so that it starts when the sinusoid  value is 1, to allow faster attack.
See the '* 0.25' here
https://github.com/Ixox/preenfm2/blob/master/src/synth/Osc.cpp?ts=4#L178

I don't understand your second sentence.
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PreenFM2 / Re: PreenFM Eurorack module
« Last post by aze_007 on December 01, 2019, 05:26:46 PM »
Hi, I got a ready built preenFM2 Eurorack Module. It works great with MIDI however I cannot trigger a sound with the CV/Gate CV inputs. As described above I am choosing the instrument in the settings. I am on Firmware 2.09. Can anyone point in the right direction?
Thanks, Alexander
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PreenFM2 / start phase of an operator
« Last post by matrix12x on December 01, 2019, 05:05:35 PM »

Is there a way to modulate the starting phase of an operator?


I thought about maybe using an envelope to modulate the pitch of the operator slightly to cause a phase shift.
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PreenFM2 / operator feedback
« Last post by solipsvs on December 01, 2019, 04:27:21 PM »
i understand that this is too much for the cpu to produce, but what if we understood that the polyphony would diminish when using a ‘feedback enabled patch’?  is it possible to do?  i often use preenfm2 as a mono bass synth anyway.   if i dont need all that polyphony, can i have feedback?  i would dearly love to use it with preenfm2!   :P
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