not exactly sure what "smooth things down" means but i am guessing you are looking for something on the warm, dark and musical side. tara labs matches that very well so "the one" or if you want to spend a bit more, onyx is very good. these are super warm, detailed and magical imagry. a similar cable would be isoclean superfocus which has a spooky staging effect and again, warm and musical. a little different but still very smooth would be the mit oracle ac1. not a match for every piece of gear as it has an inline filter but if it does fit, it is pretty special. the ac1 will give you the absolute quietest noise floor which etches sounds super tight and detailed but still in a smooth way (vs nordost which has similar impact but forward and hard).
these are the ones i would recommend and use at the moment. pc's can be tricky...
these are the ones i would recommend and use at the moment. pc's can be tricky...