Obsession + "Const" Pitch Fluctuation issue

[MattLeschuck]

Ive noticed when using the mod matrix to lower the pitch an Octave, be it with Part A/B Semi, the OSC 1/2 Semi or the common Pitch Semi, i get inconsistent results. Often the results fluctuate by about 1 semitone. I noticed this when building patches today and trying to layer in a "sub" layer.

Im not very versed in old analogue synth emulations so I apologize if this is just an actual feature. Regardless though, i noticed my patches where sounding out of tune, and not in the good kinda drift way.

Video here showing what i mean, you can hear the obvious fluctuation when i go back to the Pitch Semi adjustment..

https://drive.google.com/file/d/1x7Fc5OaoOY9VfdaHL1-a_5wfKPO4YK4X/view?usp=share_link

[Teksonik]

Hmmmm doesn't seem to happen here on Windows. Looks like you're on Mac?

Try this patch and see if it still happens. Adjusting the two pitch values always yields the expected results here.

[MattLeschuck]

Hmmmm doesn't seem to happen here on Windows. Looks like you're on Mac?

Try this patch and see if it still happens. Adjusting the two pitch values always yields the expected results here.

Just tested your patch and the same thing happens. I can't find a pattern to it. But every few times I adjust one of the two pitch parameters I can clearly hear that it is not in tune. My only solution has been to adjust it back and forth until it lands in tune. The Spectrogram confirms that it's off when its off.

I am on a Mac using the latest version of Logic on Monterey. Im going to go test in Reason and Pro Tools and will report back.

[Teksonik]

Ok it could be an issue that only affects the Mac version or a particular DAW. I've tried over and over and can't seem to trigger it here on Windows 10. The semitone values are always accurate. I'll test it on my studio system tomorrow and see if I can reproduce it there.

[MattLeschuck]

Ok it could be an issue that only affects the Mac version or a particular DAW. I've tried over and over and can't seem to trigger it here on Windows 10. The semitone values are always accurate. I'll test it on my studio system tomorrow and see if I can reproduce it there.

Ok, just tested in both Reason and Pro Tools and the same thing happens.

Hopefully Richard chimes in.

And thank you for taking the time to test as well.

[Teksonik]

Alright, I've tested both the VST 2 and 3 versions in three different DAWs on my studio system and I can't seem to reproduce the issue there either.

We'll have to wait and see what Richard and Marcin have to say on the issue.

[Kriminal]

Nvmd

[MattLeschuck]

Alright, I've tested both the VST 2 and 3 versions in three different DAWs on my studio system and I can't seem to reproduce the issue there either.

We'll have to wait and see what Richard and Marcin have to say on the issue.

Really appreciate the help, thanks for testing.

[Richard]

It is due to how the knobs in the mod matrix works, they are not quantized but have a very high precision.

Simply double-click or ctrl+click on a knob to reset it to precisely the center, and the problem should disappear

[MattLeschuck]

It is due to how the knobs in the mod matrix works, they are not quantized but have a very high precision.

Simply double-click or ctrl+click on a knob to reset it to precisely the center, and the problem should disappear

Doing this still results in the pitch occasionally being out of tune for me when dragging to -12 for example (you can see me doing your suggestion in the video i attached). Centering to 0 by doubling clicking or control clicking is one thing, but i can only drag to get down to -12 or up to +12.

[MattLeschuck]

Just tested the RE version and it works correctly without going out of tune.

[Richard]

The RE knobs have a different range, iirc the MIDI range (127 steps).

What we could do is quantize the knob values for specific targets like Pitch Semi, so that it is no longer possible to dial in e.g. 0.1 Semitones up or things like that.

[MattLeschuck]

The RE knobs have a different range, iirc the MIDI range (127 steps).

What we could do is quantize the knob values for specific targets like Pitch Semi, so that it is no longer possible to dial in e.g. 0.1 Semitones up or things like that.

I think that would be helpful. It can be pretty noticeable when using dual mode and stacking layers that are an octave or 7th apart (when its out of tune). Im occasionally getting where its on the upper part of a semitone off (C sounds like C#)

Maybe the ability to type in values could work too?

Anyways, thanks for taking the time to explain .

[Teksonik]

What we could do is quantize the knob values for specific targets like Pitch Semi, so that it is no longer possible to dial in e.g. 0.1 Semitones up or things like that.

As it is now with Constant to Pitch Semi the knobs do quantize to semitones (at least on Windows). In other words we can't dial in a value like +7 semitones and +20 cents. Only semitone adjustments are possible.

Or am I missing something?

[Richard]

If you hold down shift for knob fine tuning, it can happen on Windows, too.