Hi,
when using certain waveforms (e.g. narrow pulse) with oscillator stacking, there is a strong DC offset at the beginning of the note. The problem only occurs with osc stack density > 1.
Steps to reproduce:
1. For either Osc1 or 2, choose VA Pulse waveform.
2. set PW to 100%
3. set Density to large value, e.g. 10
4. Amp env attack = 0
5. play note
Dune 2.2: DC offset with oscillator stackingModerators: Christophe, Mark
21 posts
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Re: Dune 2.2: DC offset with oscillator stackingtechnically 100% should be silence....
is density set to 1 or 10? you said both any other settings, or maybe upload the patch (cant test it right now anyway) Windows 11 Home - 12th Gen Intel(R) Core(TM) i5-12400 2.50 GHz -32GB RAM
250GB SSD - 1TB HDD | M-Audio Oxygen 25 V
Re: Dune 2.2: DC offset with oscillator stackingYou are right about 100% pw, but in case of DUNE, 100% means more like 95% or something.
The issue arises for all density > 1, but becomes more obvious for large values. Other than that no special settings, I started from the init patch. I can't upload a patch as I'm currently only demoing.
Re: Dune 2.2: DC offset with oscillator stackingHi,
Here is a patch using Pulse VA waveform, which reproduces the issue, and other patch using a wavetable narrow pulse, which sounds OK. You do not have the required permissions to view the files attached to this post.
Re: Dune 2.2: DC offset with oscillator stackingSo, is this going to be fixed?
Re: Dune 2.2: DC offset with oscillator stackingI don't think there's much to fix. 100% PW is pretty much an impulse. Out of interest, what would one use this for, in terms of sound design?
Re: Dune 2.2: DC offset with oscillator stackingThe issue is still there when more than 50% PW is used. It becomes more obvious with higher % though. So it's not only when 100% PW is used.
Re: Dune 2.2: DC offset with oscillator stacking
I've just checked this and there is absolutely no DC offset. For there to be a DC problem the area of the wave signal above zero has to differ from the area of the signal below zero. Consider a 50% pulse or square wave. The positive part height and width equal that of the negative part. Now, as the width of the positive signal decreases, it's height increases. However, to maintain correct frequency the negative part has to get wider, but to maintain area, and therefore zero DC offset, it's depth has to get shallower (moves nearer to the centre). Take this to the extreme whereby the positive signal is infinitely high and infinitely thin (an ideal impulse) then the negative signal will be more or less centred on zero, yet the DC offset will still be zero. Best way to check is to use something like Voxengo Span to visualise the frequency spectrum. If there is any DC offset that will manifest as a bump at he far left of the spectrum. I see why you think DC offset happens, but it's absolutely not happening here
Re: Dune 2.2: DC offset with oscillator stackingHere are 2 examples.
-First one is Dune2, PW 90%, Density 7. -Second one is Synth1, copying the sound. You do not have the required permissions to view the files attached to this post.
Re: Dune 2.2: DC offset with oscillator stackingOh, I see now. Thanks for the files. Is it important? The d.c. offset is gone after 20-30 milliseconds and is easily fixed with a low cut filter.
Re: Dune 2.2: DC offset with oscillator stackingHi and thank you for listening
The thing is that because of this issue, I always use another synth when I want to make a PWM sound. And I love Dune 2, so I'd like to use it for PWM sounds. Cutting the low frequencies doesn't help at all, since the click/attack noise does not disappear. So it is a big issue for me
Re: Dune 2.2: DC offset with oscillator stackingBut you can cut dc without cutting the low frequencies that you want. The other thing is that the dc offset only happens for 20-30 ms which tapers off in that time. That will basically add a bit of punch to your sound.
Re: Dune 2.2: DC offset with oscillator stackingRich should have left the PW as it was in V1....
#justsayin Windows 11 Home - 12th Gen Intel(R) Core(TM) i5-12400 2.50 GHz -32GB RAM
250GB SSD - 1TB HDD | M-Audio Oxygen 25 V
Re: Dune 2.2: DC offset with oscillator stackingThe DC offset issue is very noticeable indeed. But at least DUNE 2 corrects the issue in matter of milliseconds.. but you guys should see what happen in Serum (and other synths)., as it is much worse there. PWM would still be problematic in DUNE 2 as it is now, though.
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