Old 02-25-2020, 02:04 PM   #1
nognow
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Default Comp lookahead with midi tracks

If I have a prerecorded midi track with a Kontakt inst in the FX tab, is there a point in using the lookahead feature on a compressor?
Since it's not saved as an audio wave, can the comp "see it ahead"...
Thanks!
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Old 02-26-2020, 01:23 AM   #2
zeekat
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I'd be guessing there's no difference - lookahead compressor will just delay the output accordingly to process it. It's still outputting plain audio after all.
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Old 02-26-2020, 02:11 PM   #3
ErBird
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Quote:
Originally Posted by nognow View Post
Since it's not saved as an audio wave, can the comp "see it ahead"...
Thanks!
Yes it can. Reaper uses PDC (Plugin Delay Compensation) to keep all of the tracks in time with each other. If you use ReaComp with pre-comp, ReaComp will tell Reaper that it is operating with a __ sample delay and Reaper will compensate.

This is assuming you use a plugin that reports PDC to Reaper properly.

Also Reaper pre-computes your audio and effects. So even with a second of lookahead, there won't be a second of delay before you hear the audio.


Despite saying all that, I don't like comp lookahead and never use it.

Last edited by ErBird; 02-26-2020 at 02:16 PM.
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Old 02-26-2020, 03:33 PM   #4
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Sample comes out of VSTi, goes into compressor, compressor puts it in a buffer, but also uses it to calculate a gain reduction value which it applies to the sample it put in the buffer however long ago as dictated by the lookahead. Then that sample - the one from before with the gain reduction from now - is sent out. That output, then, must be (will be, naturally is) delayed from when the sample came in. The compressor also tells Reaper that it has delayed the signal in a way that should be compensated (and by how much) and Reaper does with that whatever it does.
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