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Plug-in Delay Compensation broken with external side-chain


lagerfeldt
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I wonder why, i.e. they're aware of it , as in having been in contact about it, and must realize this is not a trivial problem. This is a major problem that basically affects everybody using LPX, not just a particular plug-in.

 

Since it's a bug that was introduced back in 10.2.1, it's not an underlying issue in the design of LPX, but a bug that at least on the surface seems fairly easily fixable.

 

The lord (aka. Apple) works in mysterious ways.

Gear Grotto [YouTube] - Online Mastering.dk
I came here to chew bubblegum and kick ass... and I'm all out of bubblegum

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While they did reach out to me and ask in details about the problem I never heard back after that. Not that I have a right to an update, but radio silence is always worrying :-)

 

If it's not fixed in 10.4.3 then I'll report the bug again.

Gear Grotto [YouTube] - Online Mastering.dk
I came here to chew bubblegum and kick ass... and I'm all out of bubblegum

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While they did reach out to me and ask in details about the problem I never heard back after that.

Note that that's a fairly typical process for Apple – wether or not they're working on fixing it. My guess is they're taking it seriously but for some obscure reason it's harder for them to fix than we think, for example fixing it breaks other features or desynchronizes other audio signals etc... so they're waiting before releasing a fix.

My new Logic Pro Book is out!

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  • 1 month later...

I have a SORT OF fix that goes like this (most of the time I use the kick for ducking via sidechain, but it works for any other sound sources, I usually make a group of 16 busses just for these chains):

 

1. Send the Kick (Inst 1) to a bus, let's say Aux 1

2. Aux 1 settings: output=none, add a Sample Delay

3. Send Aux 1 to Aux 2

4. Aux 2 settings: output=none

5. insert ducking compressor onto desired track, Side Chain to Aux 2

6. on compressor, switch the sidechain to "listen" and use the Sample Delay on Aux 1 to sync both clicks (original source kick and the one that passes through the sidechain path)

7. repeat later in the project, the latency will be different as we add plug-ins

8. don't forget to check the sync before rendering the final mix

9. that's it

10. tip: you can adjust the delay to feed the sidechain kick with few ms earlier, so the sound "pre"ducks - to be honest even if Apple will correct this, I will use the same method, I find this tip pretty awesome in getting a nice, bouncy, ducking

macOS latest _ Logic Pro X latest _ MacBook Pro Retina Late-2013 i7Q 16GB RAM
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Following. Started encountering this at school in a project with lots of tracks and externally keyed compressors.

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1000 tracks is priority

 

1000 tracks is priority, because its a better argument if you want to sell the new Mac Pro! I don't think it's unlikely that the development team was asked to include the features first that make the new hardware's capabilities stand out. This was pretty clear to me after I watched the WWDC presentation.

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  • 5 months later...

not fixed in 10.4.8 , c'mon apple!

 

If you have nothing to do, you are welcome to report this to apple here.

https://www.apple.com/feedback/logic-pro.html

create track “audio 1”

create track “audio 2”

route track “audio 1” over “bus 1” to “aux 1”

insert latency inducing plugin “Linear Phase EQ” into “aux 1”

route “aux 1” over “bus 2” to “aux 2”

route track “audio 2” over “bus 3” to “aux 3”

insert plugin “Compressor” to “aux 3”

change side chain of the compressor to “bus 2”

put a identical drum-loop on both tracks

result: audio 1 <-> audio 2 are NOT in sync

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not fixed in 10.4.8 , c'mon apple!

 

If you have nothing to do, you are welcome to report this to apple here.

https://www.apple.com/feedback/logic-pro.html

create track “audio 1”

create track “audio 2”

route track “audio 1” over “bus 1” to “aux 1”

insert latency inducing plugin “Linear Phase EQ” into “aux 1”

route “aux 1” over “bus 2” to “aux 2”

route track “audio 2” over “bus 3” to “aux 3”

insert plugin “Compressor” to “aux 3”

change side chain of the compressor to “bus 2”

put a identical drum-loop on both tracks

result: audio 1 <-> audio 2 are NOT in sync

 

Thanks for the update logness. I just submitted another report to Logic. I wonder why this doesn't seem to be a priority? My guess is that we're not the only ones bumping into this issue.

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HI Pierre, just checking in to see if you have heard back yet ??? I have not been around here for quite a bit ... you guys are always most helpful with LP questions ... finally switched over to LPX and Love it .. jusst wanting to make sure i KNOW about bugs and have workarounds ...

 

how are you All Working Around this Bug ?????

 

thank you john

LPX 10.4.8 / RME Babyface Pro / mac OS 10.14.6 / macbookpro 2014 / 16gb Ram 512 SSD internal ... Happy that I stopped My PT right where it is at 19.6.0.370 !!!
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