You just can't make a guitar sound like a bass guitar, unless you put in bass pickups and string it with .45-.105 gauge or something. I've tried many times to make a guitar di sound like a bass using ReaPitch to tune it down an octave, a shitload of EQ and compression into TSE BOD and getting ok results at best. I suggest you buy Trilian, it's a billion times better than pitch shifted guitars if you are unable to play and/or buy a bass guitar yourself.