If I remember right, older versions of AE required all return values to be sent with brackets, even a scalar value like an integer. Maybe not needed but for me it keeps the code more readable. Have never had any problems with it.

So I wasn’t replacing {} with [] – but was doing two separate things. If the {code block} only has one operation, as in…

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Probably not drive the opacity, but intensity of each light – seems way more adaptable later. Driving a time remap can get messy if you later want to add more values.

Tried your expression and it worked, but usually I use [] as the return value from an expression.

Could try to replace each { # ); with [ # ];

Or try something like this:

temp=0; // default value if levels is >20
if ( levels <= 5 ) { temp=0 }; // not really needed
else if ( levels > 5 && levels <= 10 ) { temp=1 };
else if ( levels > 10 && levels <= 15…

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