What can be wrong with this expression?

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i need link value of slider control single value of scale,

 

 

screen shot 2016-10-30 @ 6.20.54 pm.png

you can first clue pressing arrow symbol

there's error in line 2.

 

you should remove [1]

 

x = transform.scale[0];

y= thiscomp.layer("audio amplitude").effect("both channels")("slider");

[x,y]



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