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The alias function replaces a channel name with an alias name. This is useful if you want to work with premade expressions from a library for example nd to create code that the compiler can handle. Instead to edit the expression and replace all old channel names with the channels names you actually want to use you can use an alias:
alias( objects_x_position, Sphere.Position.X );
Whenever "objects_x_position" is used in the expression Xpressionist will actually use the channel Sphere.Position.X for the calculation.
The difference between using a variable and using the alias function is, that you can't index a variable. An alias is a full replacement of the original channel and will be treated like a channel.
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