Cubase 14.10
found a bug in the Volume plugin, of all things.
Can you confirm?
reproduce:
I do.
Look what happens to my meter to the right when the plugin is bypassed, despite the volume fader being set to unity gain.
bypassed
on
And then just now it read -19.7 after I turned the volume down and Command-clicked the fader to get it back to unity gain. Odd.
And then… I saw that the actual number underneath the Master label was showing -0.85, so I changed it back to 0 and all is well again.
But you see in the pic, the number underneath the Master label is reading 0.00 and the fader is right at 0… so I don’t know what is going on.
I only know that the plugin is acting funny and I don’t trust it.
Level and LU isn’t the same.
It is when you’re sending a tone
Steffen is right. Loudness refers to the perceived volume of a given frequency based on psycho-acoustic findings.
Run a test tone at -18dB at 100Hz, 1k and 10k. You will hear the difference in perceived loudness yourself. Volume on the other side refers to physics alone and does not include perceptual aspects.
Easy to confuse them since there are overlaps. But as Steffen said - two different concepts. Like quality and quantity.
Merry XMas
You mean level. Volume is different again.
It happens outside the box, level happens on all places, with different measurement units.
Correct. LEVEL it is.
Send a test tone at 1K for several seconds at -18db and you will see the LU and the level both read-18. Now I don’t know what the LU reads at 100 HZ, but it has consistently been -18 at 1k for both LU and level.
But this is all beside the point because I’m not really looking at the LU reading even though that’s the biggest number on my analyzer. If you look down on the meter you also see -18 in small letters. That’s the RMS level. I was immediately seeing a drop in the RMS level and in the LU reading when I turned the plugin on, and that shouldn’t have happened at all with my fader at unity. I went to a different channel and tried it out and I didn’t experience any problem with the same plug-in. Then I came back to the plug-in I was having trouble with and for some reason I got it to start behaving correctly.
What are you trying to say?
-18dB in, no change in level, -18dB out. Everything is ok. So where is your bug?
YOU ARE MEASURING LOUDNESS!!!
The second picture is with the plug-in unbypassed. It reads -18.9. And I could audibly hear the gain drop. And yet my fader is at unity in that picture
Volume is momentary, short term a measurement over time, 3s with an overlap of 2.9s.
They’re not comparable.
I appreciate the effort you guys are putting in here but there was a problem with the plug-in. I heard it with my own ears. I should not have heard a drop in gain.
Again, you are comparing loudness with level.
That is a different method for measuring musical signals.
I get that. All I’m saying is that I put this gain plug in on a channel and I turned it on and I heard a drop in level… And you can see that drop in level reflected in both the LU reading and the RMS… That simply shouldn’t have happened. Now I’m going to go off and rethink everything I thought I knew about LUFS!
Yeah, I got it to work. And it worked on another channel. But something finicky happened. Maybe something to do with control clicking on the fader made it look like the gain was back to zero but it wasn’t exactly. I don’t know.
There are two possible faders for level control in the plugin. Ok, with mono signals it is obsolete to have a master level control, but with surround signals it makes sense.
You can change every channel and the over all level with the plugin.
I must say thanks to @shagazulu, your problem let me test the plugin and I learned something about the new “Volume”.
Yeah, sorry and Merry Christmas! 
