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  #11  
Old 04-22-2021, 04:44 PM
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paul_g paul_g is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

Anyone do a YouTube video on this?
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  #12  
Old 04-22-2021, 07:32 PM
Tweakhead Tweakhead is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

It always helps a bug to get fixed quickly when nearly every signature in a thread is longer than the post it is associated with. Avid techs love this. It helps their "wading process".
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  #13  
Old 04-23-2021, 08:23 AM
Rich Breen Rich Breen is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

Quote:
Originally Posted by daeron80 View Post
Holy smokes. That means the mixer has reverted from floating- to fixed- point type.
I'm not sure that's what it means at all. The 'mixer' seems to be OK as you can increase gain with faders all you want without issue - something specific to this particular method (audiosuite, clip gain) is creating the issue, no? Anyway, not enough time to really go down this rabbit hole right now - again, I don't think this affects my workflow as I can't imagine why I'd ever want to clip-gain something 20dB over full scale, but I'm curious to see what's really happening.
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  #14  
Old 04-23-2021, 08:40 AM
daeron80 daeron80 is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

Quote:
Originally Posted by Rich Breen View Post
I'm not sure that's what it means at all. The 'mixer' seems to be OK as you can increase gain with faders all you want without issue - something specific to this particular method (audiosuite, clip gain) is creating the issue, no? Anyway, not enough time to really go down this rabbit hole right now - again, I don't think this affects my workflow as I can't imagine why I'd ever want to clip-gain something 20dB over full scale, but I'm curious to see what's really happening.
Could be. The OP said "The same issue occurs using any other method when you go past +20dB within the Protools mixer, like having 2x +12dB trim on a track.

Delving deeper into this, it looks like any sample OVER +20dB is processed as -INF. So it's not digital clipping where anything over +20 is just clipped at +20."

I saw the first statement and jumped to my original conclusion. But the second statement seems to contradict the first and to introduce the idea of an overflow bug in the mixer code. I'm in the middle of a project involving 16 hours of content or I'd do some experiments to see what's really happening to the waveform.
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  #15  
Old 04-26-2021, 02:56 AM
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

Quote:
Originally Posted by Rich Breen View Post
I'm not sure that's what it means at all. The 'mixer' seems to be OK as you can increase gain with faders all you want without issue - something specific to this particular method (audiosuite, clip gain) is creating the issue, no? Anyway, not enough time to really go down this rabbit hole right now - again, I don't think this affects my workflow as I can't imagine why I'd ever want to clip-gain something 20dB over full scale, but I'm curious to see what's really happening.
I'm not seeing this. When using the mixer alone I get distortion as well. Using track volume, aux volume and masterfader volume, any combination.
(can't use trim volume as it doesn't allow you to go past +12dB)
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  #16  
Old 04-26-2021, 03:23 AM
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

I have not even bothered testing this. Seriously guys if you need to boost 20dB over full scale there is something wrong with your mix
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  #17  
Old 04-26-2021, 03:37 AM
XJENSEN XJENSEN is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

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Originally Posted by JFreak View Post
I have not even bothered testing this. Seriously guys if you need to boost 20dB over full scale there is something wrong with your mix
The matter of the fact is that something is wrong with Pro Tools.
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  #18  
Old 04-26-2021, 11:58 AM
wwittman wwittman is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

What's an example of a reason you'd want anything 20 db over full scale??
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  #19  
Old 04-26-2021, 12:27 PM
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

Quote:
Originally Posted by paul_g View Post
Anyone do a YouTube video on this?
Who cares about utube??? This isn’t Gearslutz and we don’t need a YT video to know its a bug so why would anyone waste their time with that?
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  #20  
Old 04-26-2021, 12:27 PM
daeron80 daeron80 is offline
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Default Re: PT mixer headroom severely reduced to 20dB over 0dBFS. Bug?

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Originally Posted by wwittman View Post
What's an example of a reason you'd want anything 20 db over full scale??
I've done it to test the validity of the assumptions about floating-point mixing. They're correct when the tool is functioning as advertised. But, yeah, other than that, it would just be a comfort that a freak accident isn't going to ruin hours of work.
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