i have followed all the steps and it seems my biggest issue as of now is when i launch the rsinjector file nothing happens,  if i i open rocksmith directly through steam i can see the new content but after  tuning the song never starts. 

i have read in the directions that if i launch rsinjector rocksmith should launch from there 

 

any help out there

I'm not sure what directions you're reading, but RSInjector is no longer used.

 

You can find proper instructions here:

 

http://customsforge.com/topic/33889-how-to-add-custom-songs-on-mac

thank you very much everything works great now.

really thankful for your help