Expressions in combustion are a means of introducing an embedded programming environment into the application. The sound of this (argh, math!) sometimes turns people (artists) off and yet it excites others (coders). Working with expressions can be taken as deep as you want to go, yet they should not intimidate you because of their programming nature. With a few simple tips as background, you can be well on your way to customizing animation controls to your specific needs.

The good news about this whole inclusion of the JavaScript programming language is that there are two means of creating expressions that allow nonprogrammers access to its power ...

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