With this iExpression you can make the source text of a text layer react on a beat which you created using one of the beat detector iExpressions. When there is no beat the layer has its normal text is if no iExpression has been applied. When there is a beat, the text changes to what you specify in "Text on Beat".
Link to Beat
Don't put a number here. Use the link button to link this to a property to which you applied a beat detection iExpression.
Text on Beat
the text which the text layer should show during the beats.