The 7 levels of bass roll off can be quite useful, i'd say go with it! As for the level control for a Sony MD...hell yes, you will need it. Say, i have two sound professional battery boxes, the big one that has a clam-like shell that locks and a mini battery module, i can take pics. Both feature the level control and 7 bass roll off switches, interested in buying one of em? They are in great shape. Pm if interested.
George