How to create bounce effect with text animator?

This is actually a little tricky, but here is a basic solution:

Set your font to the size you want it to be when it's at "120%" size - ie 'at the top of it's bounce'

Set up your text animator / range selector as below:

Scale: 100% , 0%

Range selector > Advanced:

     Units: index

     Shape: ramp up

     Ease low: 100%

Range selector:

     Start : 0

     End : 1

   Offset : animate this from -1 to the number of characters in your word

Duplicate Anmator 1 to get Animator 2 below it. In animator 2 modify the settings as follows:

Scale: 100% , 83%

Range selector > Advanced:

     Shape: ramp down

     Ease low: 0%

     Ease high : 100%

Range selector:

   Offset : drag your two keyframes down the timeline so they are approximately '1 character' later in time than animator 1. 

Easy, hey? : )