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utokusa / OS-251

OS-251 is a synthesizer plugin

Home Page:https://onsenaudio.com/products/os251

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Chorus produces (undesired?) crackling noise

CrossGridder opened this issue · comments

commented

I don't know if it was planned, but there is a crackling noise that doesn't seem to be a feature. I am attaching a preset with very few parameters turned on. Only saw is working, you can check the other 2 easily. The preset is in AU format, if you need any other format, please let me know. I couldn't find a way to save presets in a proprietary way. This is leading me to open a new REQ :). Sorry, I am giving you a lot of work :)
Test1.aupreset.zip

commented

Test2.aupreset.zip
Here is another example, this one is even more evident. Move the LFP Env -> Filter to appreciate the nuances.

commented

Thanks, I will check it.

commented

Let me make sure what is the crackling noise that you mentioned.
I uploaded 4 wav files. Is there the noise?

exports.zip
Please be careful of the volume. It may be loud because I normalized them.

If it doesn't have the noise, can you give me an example wav file and the DAW's project file?

commented

No, your files have no noise.

I was kind of dumb, it's not the oscillators, it's the chorus, always noticeable when it's on, but even more when LPF env -> filter is set between 0.4600 and 0.6300

Here's a zip file containing the project with 3 midi tracks + 3 audio tracks without Logic HPF + 3 audio tracks with Logic HPF.
NoisyChorus.zip

The crackling when the builtin chorus is on is always present, with the Logic HPF turned on you can appreciate it even more.

  • 1st track - Saw Osc alone + Logic EQ set on Hi pass returns no crackling

  • 2nd track - Saw Osc with builtin Chorus + Logic EQ HI pass RETURNS CRACKLING

    • It is a kind of a noisy loop, it breathes with the oscillators, seems like some kind of LFO modulation.

  • 3rd track - Saw Osc with 3rd party free Tal-Chorus (Juno-60 chorus emulation), which of course doesn't sound like the
    hardware, but it's crackling free.

commented

Thanks for detailed explanation. It is very helpful. Now I have a clear idea about what is the noise.
Actually I knew the sound, but I thought it was just a trait of the chorus because I couldn't find any noise with the sin oscillator, and I didn't care much about it because I thought it was interesting.
However, now, if I increase the volume, I can find the noise even with sin.
So this is obviously weird because chorus is basically just a delay effect.

I've just started an investigation. Thanks.

commented

Hi @fedeb1979.
I found out the reason. It was kind of a quantize error in the time domain.
I reduced the noise by using delay-line interpolation.

It's not released yet, but you can try the fixed version from https://github.com/utokusa/OS-251/releases/tag/v_test_pr_26_chorus_noise.

This ticket was automatically closed, but feel free to ask anything :)
Thanks

commented

Wonderful! I am downloading it now and let you know soon. Thanks!

commented

Yes, you fixed it, wonderful job!!!