unfortunately, Correct me if I'm wrong... Artists like to hear beats mastered.. they don't know that its mastered, but they like a beat sounding loud and full.. Honestly, If you mix the beat correctly and master it correctly, it will sound clean and full.. when the artist applies vocals, honestly it should sit in the middle. The mix by the producer pans all the sounds and what not.. let an artist hear a beat that is not mastered and they say "hey, that beat sounds low, can you turn it up".. if you work with an artist that you personally do work for.. then yes.. you will have the artist record on the beat, then you would mix the sounds around the vocals. But when selling your beats, artists respond better to fuller, louder sounding beats.. loud does not mean distortion.. and does not mean to just boost.. mastering in itself is not just boosting sound.. but thats another post in itself.