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Author Topic: FM amount is changing by itself  (Read 509 times)

EpicRiser

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FM amount is changing by itself
« on: October 01, 2020, 05:56:27 pm »
FM amount is changing by itself without any modulations. The change happens in sound output only, UI indicates constant FM amount as intended. The first image shows the changing sound waveform in FL Studio and Studio One, same pitch (F3 in FL Studio, F1 in Studio One), two bars at 120 bpm. The second image shows the patch the sound is recorded from, no effects. I notice audio changing audibly in both daws. I don't notice audio changing audibly in standalone mode, so it probably works as intended in standalone mode.
https://i.imgur.com/sPFJdYw.png
https://i.imgur.com/5k33QZg.png
« Last Edit: October 01, 2020, 06:07:49 pm by EpicRiser »

LBH

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Re: FM amount is changing by itself
« Reply #1 on: October 01, 2020, 06:55:44 pm »
Hi and welcome to Arturia forums.

Please post the preset itself, so it can be tested. If it's a factory preset, then the name is enough.
No modulation should be going on, unless something is doing the modulation. If it work it standalone mode, then that could indicate, that you have added modulation in the DAW somehow.

EpicRiser

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Re: FM amount is changing by itself
« Reply #2 on: October 02, 2020, 12:04:44 am »
Here is the preset.
I don't believe there is anything from the daws affecting the sound. The waves look similar in both daws and they sound the same as far as I hear.
« Last Edit: October 02, 2020, 12:13:16 am by EpicRiser »

LBH

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Re: FM amount is changing by itself
« Reply #3 on: October 02, 2020, 01:24:13 am »
I have Studio One 3 professionel. Can you actually hear something is wrong?
I hear the same thing if i use the standalone, the plugin or the recorded audio from the plugin. So if what you mean is'nt there in standalone mode, then i can't confirm anything is wrong.
I can hear a drift on long notes, and that's it, but that's also in standalone mode.
Are you talking about a slight drift or an actual modulation of the parameter? If it's a drift, then does it help to change the PHASE MOD to SELF instead of KEY?
« Last Edit: October 02, 2020, 01:46:52 am by LBH »

EpicRiser

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Re: FM amount is changing by itself
« Reply #4 on: October 02, 2020, 03:05:16 pm »
Changing the PHASE MOD to SELF instead of KEY solves the issue. Thank you!

It was just a guess that FM amount was changing, I should have been clear about that, sorry.
All of the following is before applying your solution. I do hear a sound change in the first 2 seconds or so. The change is even more pronounced at 0.080 FM amount in the same preset, the saw sounds quite obviously affected by FM with a drifting quality to it, then after a few bars it changes suddenly to what sounds to me almost like a pure saw without FM. That's what prompted me to think that FM amount must be reducing. Here is the sound wave at 0.080 FM, in the top left - zommed in part at the start, in the top right - zoomed in part after a few bars, looks way less affected by FM, at the bottom - the whole sound. You can see a sudden change in zommed out view, happens around 14th bar.
« Last Edit: October 02, 2020, 03:07:15 pm by EpicRiser »

LBH

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Re: FM amount is changing by itself
« Reply #5 on: October 02, 2020, 04:03:42 pm »
I've made the same observations as you describe. But both in the standalone version and the plugin.

It's good if the SELF setting helps.
When using KEY in the Phase Mod, then i actually exspect a reset each time a key is pressed. And i do think the wavetable is reset, but the Modulator seems not to be reset, and that may cause a unexspected behavior. I'm not sure if this is intended behavior or not.

I'm not sure what's going on. Perhaps ask Arturia support.
It can be about understanding the Phase Mod.

Igro

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Re: FM amount is changing by itself
« Reply #6 on: November 20, 2020, 07:07:51 am »
There is very similar issue with two orher controls - Wavetable Fold amount/Wavetable phase distortion. When there is no Unison involved, dialing these controls at various positions gives a stable tone. However, once the Unison is involved we get a random jumps in harmonics. Like if they were modulated all the time. Phase retrigg is set to zero.

Reported to Arturia long time ago. They have confirmed this, but then just forgot. Very disappointed with ithe company.

 

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