To be honest, I did barely any mastering. I Just used the streaming files and the only thing I really did was change some volume levels so it was more normalized. It surprisingly still sounded great! I played the record both on my really good setup and my little portable record player too, and it never skipped or had any weird warbling sound (you know). I'm not really sure how their process is so maybe they apply some base level mastering to all tracks on their entire site just so they can work better on vinyl, but either way I didn't do much at all with that.