How to automatically synch audio across different compositions in After Effects

This is the expression used in the tutorial:

MasterC = "Name of you main composition here";

C = comp(MasterC);
L = C.layer(PreC);
Main_T = time + L.startTime;

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[aravinthphone]

You saved thousands of hours of artists worldwide, ,, thank you

[joaomarcostroquez]

To the people facing the error with the expression, it's because the audio precomp (with the expression) is not supossed to be in the "main_comp", but it should go in the compositions inside the "main_comp"

[hotcoco]

Thank god, now I won't have to play the guessing game of 'will it synch?' when dealing with the nested comps in my project!
Much love and thanks for the tutorial

[johannesbruns]

Great Tutorial! To avoid expression problems with the Audio pre comp, delete the audio pre comp firstly from the main comp (just have the audio pre comp inside a pre comp inside the main comp) and put the audio pre comp in the end back into the main comp.

[veganground]

This has just saved me a lot of time. Thanks so much.

[sahilchandrakar]

Brother you made my life easy, love you mannn

[visualdreamtrap]

thank you so much. had so much struggle in my last project. u safed my workflow

[TRECTArchitekci]

YOU ARE THE SUPERHERO, YOU JUST SAVED THE WORLD <3

[laurentmeunier]

Wow ! I wish I knew this tip for years ! Thank you so much !

[mpty]

thank youu man, saved the guessing game

[processing__]

Thx this was super helpful !!! it's sad that u can't do that in a simpler way, definitely will revisit this to copy the script

[Shadoufang]

Damn! I didn't know we can use a layer as a guide! ;'ooo
Thank you! :'D I'm subscribed :')

[maaxeduardo]

Thanks Ema! it's helpfull mate!

This expression u can sync and update in realtime in main comp too

After Effects tutorial using expressions to synch-up audio across different pre-comps.

compStartTimeInParent =
audioStartTimeInParent =
fullStartTime = this.startTime;
fullEndTime =

linear(time, fullStartTime, fullEndTime, fullStartTime+compStartTimeInParent-audioStartTimeInParent,

[boybulag]

Wow! This is brilliant Eman, thanks :)

[yoyryrh]

Heads up, if you make a change to your precomp layer's name, for some reason after effects won't recognize it, even if you change it in your project panel!

[polaris]

doesn't work, gives an error saying the "composition is missing or does not exist exist" even though I typed the name verbatim.

[eladet]

Man this is so useful!! thank you so much :)

[joeypunkrock]

This is perfect! Thank you so much! xx

[difausto-immiran]

Thank you so much, it is such a tife saver !!

[robertolopezfoto]

Subscribed, My respect, I just got like an our back now