Here is the Functions menu of Xpreessionist. Here all available function that you can use in your expressions are listed in logical groups.
If you coose a function from one of the categories of the menu it gets inserted at the current text marker position in your script. The first argument will be highlighted to be instantly replaceable with a channel or some text you may want to type in.
To get an explanation of the function groups that are listed here just click on the group in the screenshot on the right.
The functions will be grayed out if you are in the channels or preference tab.
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