Sub osc out of tune?

Kaffimusic · Post by **Kaffimusic** » 01 Feb 2021, 18:26

Hello,
I encountered some strange behaviour while programming a synth bass sound on the NS3. When choosing a simple saw wave, and add a - say triangle - as suboscillator, it seems they are not in tune in a way that I can hear phasing. With a saw wave this results in clearly audible shifting and frequent loss of high frequencies, as it was modulated by filter+LFO, but it´s not. The effect is most audible when switching on LPM+Drive. It´s not possible to create a steady tone without permanent shifting. This is pretty annoying. Is this a bug or intentionally?

baekgaard · Post by **baekgaard** » 01 Feb 2021, 19:51

That is part of the analog modeling

Yes, Nord could make it perfectly in sync, but then it wouldn't sound like an analog unit.

Sent from my phone in brevity

Post by **Mr_-G-** » 01 Feb 2021, 20:14

Kaffimusic, can you post a sample for those of us without an NS3?

Kaffimusic · Post by **Kaffimusic** » 01 Feb 2021, 20:31

Well, here I attached an example. This is a Tri wave + Saw as Sub. Just slightly mixed to it. Here, filter is set to LPM + drive lvl 2. After some seconds I turned up the resonance, so you can clearly hear there is no filtering going on. Resonance would have been going up and down, but it does not. I also assure you, there is no LFO attached to the mixing between the waveforms.
This way it´s not possible to have a steady tone. Shifting is sometimes nice, but not here, and I´d like to be in control when it should and when it should not.
Regarding analog modeling: This sound is a wannabe-recreation of a Moog Sub-Phatty sound. This one is definitely analog, but it does not do something like that.

baekgaard · Post by **baekgaard** » 01 Feb 2021, 21:04

Could you share the program? I'd like to test to see what is going on...

Sent from my phone in brevity

Kaffimusic · Post by **Kaffimusic** » 01 Feb 2021, 21:13

Okay, this is the example.
BTW: I just played around with it, when you make it vice versa (Saw as main, tri as sub) and turn the mix to mostly the tri and just a bit saw, it´s even more extreme. The saw seems to fade completely and returns.

Post by **Mr_-G-** » 01 Feb 2021, 21:15

Hm...yes, I can hear that, the cycle is about 5.5sec. I doubt it is a 'feature'.
Just in case, have you tried initialising the synth section and setting the oscillatos again?

Post by **Mr_-G-** » 01 Feb 2021, 21:18

But I am not sure that is phasing...

Post by **Mr_-G-** » 01 Feb 2021, 21:23

Oddly enough florence's online NS3 file viewer does not recognise the file you uploaded. ("Unsupported file")

Kaffimusic · Post by **Kaffimusic** » 01 Feb 2021, 21:27

Oh, I just started everytime with a plain and empty program. There are not many parameters to set, goes pretty fast. Just switch on the synth, set to tri, turn to mix with saw, turn down saw to sub, turn mix to mainly tri and just a bit saw, filter full open, drive switch to 2. There you have it.

Edit:
You get the same when you use 2 tri in detune-mode (second as sub). As soon as you add 0.03 detune it starts to cancel out frequencies. It´s not so strong there, cause there are not so much high frequencies in the wave.
My conclusion is, when you choose to mix two different waves, and one as sub, it is not exactly 1 octave down, but a slightly bit off. Sometimes this is nice, but with that sound it is not. Since there is no parameter to change the tuning like you have it with 2 identical waveforms, you can not do anything about it.

I did some more playing around with it, it happens also when you use sine + saw.

I don´t know why the file does not seem to show properly, I saved to my PC some minutes ago and uploaded it just like the program manager has thrown it out.

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