Open the ACE Clippi tool and click on "Change manual options", then tick the box for "Ball tracers".
ACE 1.13 RC5 [2011-12-09. Hotfix: 2012-04-27]
ACE 1.13 for OA [2011-12-23]
ACE 1.3 for A2 [2010-07-05] (Deprecated)
Open the ACE Clippi tool and click on "Change manual options", then tick the box for "Ball tracers".