what is this function in timeline panel (V1 V2 V3.....)

I am sorry for my bad English,

I have no idea about V1 V2 ..../ A1 A1 for what? how to use that?

when enable/ disable but nothing happen

What is different front and back function between locking sign

Please , help me find out

Thank you in advance

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Inspiring

The buttons on the left are Source Patching, the buttons on the right are Track Targeting:

You can learn about what they do here:

MtD

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