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Comments
@flo26 : I hear the same thing in MHR810 and there are things that seem to influence it. That artifact (a fixed pitch with very low frequency and a resonant quality) seems much louder to me when the sample rate is 48k than when it is 44.1k. It is more prominent at some buffer sizes, too. I think 256 might have been worse than 512 (or the other way around).
Does the sample rate make a difference on your rig?
And once you become aware of it, it is hard to ignore. FWIW, I wasn’t using the noise gate.
Nothing really makes it.
Try something else if you please:
Use another amp sim (amplitube works great in aum)and then ,in the fx slot,insert one of their fx apps.
You will hear the same thing.
Some of them seem less prone than others.
I’m actually testing all this.
Time for a cigarette😉.
@espiegel123 ,To be more precise,yes sample rate and latency influence this behavior,but nothing really fixes it.
@flo26 you are absolutely right, there’s a persisting tone of aprox 175 Hz while you play.
I have no idea what can be producing it, but it’s clearly audible with headphones or good speakers
@flo26
I just measured it with 4 pockets Analyzer and it’s in fact a tone of about 175 Hz.
This picture was taken while you play the first note (C5) which is approximately 523.25 Hz. You can clearly see the C5 note and higher harmonics, but there’s a very significant peak below at approximately 175 Hz.
@rodolfo: Are you also finding it only in the AUv3?
Yes, this is a picture of the first part of the video (standalone app) while @flo26 plays the same C5 note, and as you can see there’s no peak at 175Hz
@Rodolfo ,thanks for taking the time to do this.It’s really kind.
Now,let’s see if @NembriniAudio can fix it.
Yes, probably 350Hz...
Here’s the video of the frequency test just in case.
It is worth mentioning that when buffer size is set to 64 the peak is not so prominent, although still present.
Possibly coincidence but 44.1 x 4 = 176.4
When it comes to persistent tones you'd trace it back to something that doesn't vary.
This ratio of a sampling rate is probably a clue.
Is there a simple way to force a 48kh sampling rate as the default for A/B comparison
purposes? I generally ignore the threads about sampling rate because they always seemed to be iPad model specific complaints. Usually one of the Pro's I think.
@rodolfo: is it more prominent for you when sampling rate is 48k?
I haven’t tested at 48KHz, it’s just an iPad Air 2 without any audio interface connected, and I’m not using the Nembrini plugin (I don’t own it), just the Youtube video.
Well, this is interesting. I tested the Nembrini MRH810 (the plugin I own) with a 1KHz tone at different buffer sizes (48KHz).
The 175Hz peak is present with a buffer size of 256, but it changes to other frequencies with different buffer values.
I had heard this...
Weird 🤔...
I’ve deleted the video because i don’t want to harm @NembriniAudio ;
I had just posted it as an audio example of what was happening.
Let’s hope for a quick fix by @NembriniAudio .
Flo
Hi Guys,
we tested our app in more than 20 devices with different DAW changing sample size or sample rate and so far we can not reproduce the weird noise.
We did the test with our internal instrumentation for avoid unknow behaviour of third party app.
We keep the issue under control,
Thanks guys,
Igor
Has anyone tested this outside of AUM?
It works in standalone mode,but not so well when used in a host.
In trying to reproduce this without a guitar I've learnt that Riffer's octaves are out by one. C5 is labelled C4 there, I'll put in a bug report.
Anyway, struggling to reproduce on a first gen iPad Pro with the latest iOS.
Will try again when I can break the guitars out.
Does that apply to other hosts? Cubasis for example? @NembriniAudio are saying they tested in a "different DAW", and can't reproduce the issue. It would be good to know what DAW they tested in and if it's an issue specific to AUM or if it happens in other hosts as well.
I’ve just found out that if you use the same nembrini apps in the same hosts,but as Inter app audio apps,the problem is gone.No more disturbing frequency.
There is really something weird with the auv3 porting.
From @Rodolfo 's tests, it looks like these tones may be related to the buffer update frequency. A test in another host (AudioBus, GarageBand?) might show whether the effect is due to AUM or the Nembrini AUv3 implementation.
Yesterday,i’ve Tested this in Audiobus and auria, and had the same results
@flo26 Great, so that lets the hosts off. Could still be a glitch in the underlying Apple AUv3 implementation, but does seem more likely to be on Nembrini's side.
FYI, octave numbering between devices and apps is not something for which there is a standard. (Unlike MIDI Note Numbers)
Just a question real quick. Is this noise also present when using plugins instead of guitar? I used a guitar in platinum synth and didn’t found the noise/tun/bug in AUM.
@flo26 @Rodolfo @NembriniAudio : while recording some experiments (44k and 48k at a variety of sample rates) to help Nembrini audio hear the issue, I noticed that you can hear the problem easily by having no input being sent to the plugin.
If you do this and crank up the Volume, you hear that there is a constant fixed pitch present even with no input signal. The exact pitch changes with both buffer size and sample rate. The level is low enough that one might not notice it in many cases. But in some cases, it is prominent enough to be an issue. All volume controls influence it, but none others.
If you guys try it and can’t reproduce it, let me know and I’ll post some examples.
This was with MRH810. I did not notice the same issue with the chorus but I didn’t put a lot of time into the effects.