i don't own the original rs1 dlc compatibility ,i have the patch from here and i am not sure if you understood but i can play song ,the weird thing is that i can't find it anywhere in the rocksmith folders and i don't know where it's hidden. i wanted to get it out of the game to see if it's really the problematic one.(i am sure it is because i already took out the rest of cdlc's) about the cfsm ,yes i'll try it ,i don't use it usually and i have the feeling it slows rs down (maybe false feeling)but yes i will try it. thanks!