Author Topic: Workflow tips for automating correction of clipping in master during mixing.  (Read 8126 times)

Khron1k

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A common problem I find myself running into during mixing is correcting for clipping in the master track. I imagine my workflow is pretty similar to most people just starting out:
  • Get all instruments sitting at a level that seems to fit.
  • Attempt to record
  • Notice a spot in the track that is clipping a few percentages of a db on master track
  • Figure out what layers are causing the clipping, and either add a little sidechain and/or adjust the levels of tracks
  • Repeat from step 2 indefinitely until all spots have been adjusted for.

Coming from a Software Engineering background, steps 2-5 strike smell to me like a process which should be automated by software to some degree. At least in regards to identifying the positions in the track which are clipping as well as frequencies which are causing clipping, while leaving the actual adjustment of the tracks up to the producer.

Basically, my ideal workflow would be something like below:
  • Get all instruments sitting at a level that seems to fit.
  • Pass master layer through some tool.
  • Tool spits provides annotation of some sort where clipping has occurred as well as frequencies responsible.
  • I go fix it up.
  • Repeat step 2 to verify that all have been fixed.

Does anybody know a tool which will do something similar, or at least will help partially automate the above process?

Cheers.
« Last Edit: March 19, 2016, 08:12:15 pm by Khron1k »

Marrow Machines

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I don't agree with you about having a software that "fixes" those clips from happening.

The clips typically appear because of dynamics, build of up frequencies at that point, and volume due to the lack of compensation of the previous two points.

I also don't agree with side chaining, because that doesn't do any thing to actually control any of the three points above.

If you're using groups and you do get the things sitting right, i would consider adjusting your group volume, because  you get to maintain the ratios of your individual tracks but instead lowering the overall volume of that entire group. IE drums, bass (not sub i leave that to go into my master/premaster), leads, sound effects and fills.

If you're still having trouble, apply some group compression. I haven't experience RMS compression, because that particular component in reason's mixer isn't as versatile as i'd like. so i end up using a peak compressor.

But use the compressor as a compressor, i wouldn't recommend messing with the outbound volume, or input volume.

If that's not working, reconsider WHAT you're eqing and adjust group or individual volumes in the group channels (if you have them).

That's generally my work flow when it comes to identifying peaks, but i tend to get them early on and nip it in the bud.

I also tend to start lower in volume and then move up, rather than start at higher level. There's less room to go up, and you have less reference points to consider as well.

ps, i don't side chain any thing. I love how the layers work together to get things nice and fat. #teamwork
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Khron1k

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Hey, Marrow Machines, sorry it appears that there is a misunderstanding somewhere.

I'm not looking for the software to actually do the correction for me, just to do the detection of where it is occurring and what frequencies are causing all in one pass, since bouncing back and forth seems to be an inefficient workflow.

Devout

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Are you asking whether or not there are plugins which identify the specific frequencies which are triggering the limiter?
If so, I'm sure there are many multiband compressors/limiters that do this. An obvious one that comes to mind is the Waves L3-16.

I don't believe I've ever seen a tool which identifies exactly which parts of the track are clipping without first rendering or playing back the track, but I would love to be corrected.
« Last Edit: March 20, 2016, 02:21:39 am by Devout »

Arktopolis

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Unless I'm misunderstanding you, what you're looking for is "mixing with headroom". That is, mix everything so that the master peaks well below 0dB, like -6db or even lower. You can adjust the loudness with fx on the master channel afterwards.

If there are huge peaks in your signal, some common culprits for these are:
- zero attack or zero release in a synth
- a sample cut at somewhere else than a zero-crossing

FarleyCZ

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Get all instruments sitting at a level that seems to fit.
I'm not sure if you speak about recording of live instruments or recording of synth layers, but either way, the mistake is right there.

Your input levels to any recording aren't about what seems to "fit", but about how loud you expect the signal to get. So, if you don't know for sure, set it crazy low. Like with 20 or 30db headroom. Magic of 24-bit or 32-bit recording is, that there's so much dynamic range you won't get any qualitty loss when gaining the signal afterwards in your DAW. ...which is also the point where you can take care about any overly-resonant frequencies that might have caused your clipping otherwise.

So in short: Record quietly, but once. Then gain it and fix whatefer you need in your DAW.
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Khron1k

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Hmm, thanks for the criticism, looks like I have some serious mixing changes to make...

Marrow Machines

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Hey, Marrow Machines, sorry it appears that there is a misunderstanding somewhere.

I'm not looking for the software to actually do the correction for me, just to do the detection of where it is occurring and what frequencies are causing all in one pass, since bouncing back and forth seems to be an inefficient workflow.

I would hope so, but i thought about it during a car ride and it would be really helpful for a software to do that.

Hopefully i've underlined some mixing procedures that will help during your mastering.
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