this is very very easy to do and it looks good
http://www.youtube.com/watch?v=Dtq_tUmeKEA
film like you normally would
press y(triangle ps3) till it says speed
place a marker at wear you want the ramp to start at %100
place your second marker in the middle of wear you want your slomo at about %40 or %50
place your third marker at %100 wear you want your slomo to end
thats it..
it does it for you...
and you dont need the filmer pack
thanks BB