Hi, I'm sorry, but I bought the EVO 75 to reduce complexity. I only ask for one thing---the ability to modify the base and treble. I have B/W 703 bookshelf speakers and the sound can get a bit muffled. I used to have tone control, but now I don't. Do I need to add anything? I'm about ready to punt this thing out the window and go back to my Marantz, which at least had a nice EQ option even if it was complicated.