Matching Gain Before And After Effects

[orange]

@d-healey

So maybe what I need is a threshold for the amount of variation to compensate for?

You are now describing limiter/compressor/expander

[ustk]

@d-healey said in Matching Gain Before And After Effects:

Sure they are, the knob is automatable for exactly this purpose. If the input goes up during playback they can bring down the output, and vice versa.

In this case effectively you fall in the slow integration case and you might go down the input/output compensation. After all, the ancestor of a compressor was a fader adjusted manually...

[d.healey]

@orange Some compressors have auto makeup gain, how does that work because that's what I want :)

[ustk]

@d-healey To me, auto make up is a fixed compensation based on the different settings you adjusted, not an IN/OUT comparison (but I might have wrong here, or at least for some references)

in this case, Auto make-up is not assimilable to gain line automation (the fluctuating signal has no impact on the auto gain that is set. On many compressors, make-up gain is simply a gain control, auto-make-up is a gain control compensated when you dial the comp parameters

@orange exactly, Dave eventually described a comp/expander.

[d.healey]

@ustk

Dave eventually described a comp/expander.

Not quite, I didn't mean a fixed input gain threshold, I meant a threshold of gain difference between the input and the output. So if the difference between the two is more than X turn the gain knob to compensate.

[ustk]

@d-healey I see... Are you not afraid a threshold can lead in some nasty fluctuations?

I'll try to make scriptnode example that should work...

[d.healey]

@ustk

Are you not afraid a threshold can lead in some nasty fluctuations?

I don't know what I'm doing or talking about so I have no fear

[ustk]

@d-healey "FearlessDave" :beaming_face_with_smiling_eyes:

[Dan Korneff]

@d-healey said in Matching Gain Before And After Effects:

Some compressors have auto makeup gain, how does that work because that's what I want

I had to calculate a formula for a makeup curve depending on the settings of the compressor controls. It looks like this:

Math.log(((-Threshold.getValue() * 10) * Ratio.getValue() +1) + (((200 - Attack.getValue())+1)/100));

Results may vary :beaming_face_with_smiling_eyes:

[d.healey]

@Dan-Korneff Thank you! Looks like I don't want that after all, but still useful to know.

[ustk]

@Dan-Korneff said in Matching Gain Before And After Effects:

Results may vary

Thought we didn't want gain fluctuations...

[Dan Korneff]

@ustk "Results may vary" means the calculation isn't perfect. It's a constant level, but doesn't work great for light compression or extreme compression since peak Gain Reduction isn't factored in. Every other setting seems to balance out nicely.

[ustk]

@Dan-Korneff Yeah that was just a stupid joke attempt...

[Dan Korneff]

@ustk
ha! my brain must not be working yet.

[ustk]

@d-healey Alright I have made a little example of IN/OUT compensation that seems to work, with integration time, sensitivity is just a difference multiplier. High difference with ultra low smoothing time will make the pumping very apparent, so from there I guess it's just a matter of finding the most transparent settings...

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[ustk]

@d-healey I forgot the threshold part... Hmm, I don't obviously see where to put one in this example

[ustk]

@d-healey A wee bit better with Threshold and DRY/WET and FX LEVEL for testing purpose...

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[d.healey]

@ustk Wow thanks! I shall play around with it.

[d.healey]

@ustk That works really well!

[ustk]

@d-healey Glad it’s what you needed!