As I understand it the +4 db "pro" trim level is made for the purpose of driving higher signal level over line level interfaces for the obvious reason that the noise induced in a long connector will be lower by comparison. Makes sense. However, if I don't have a noise problem because line level connections from pre to converter are balanced and 10 inches long, then, am I making my preamp work harder by selecting +4 in effect creating more noise? If all I do if generate more signal and then attenuate it at the other end, it seems like I've gone to a lot of trouble to amplify a signal only to attenuate it - can that really be a better mousetrap? Is it possible I'll get better results with the -10db option on some of the equipment. Also, what happens if I send at +4 and receive to a interface which assumes -10 - other than the obvious fact that I will have to attenuate it somewhere else?