I'd love to be able to place a line, that you could see and that would reach from one end of the track window to the other side, at a certain decibel level. That would help set all fades in different places to the same level. So if I always start my vocals over music when the music has faded to a certain point, I can then easily replicate that by seeing a horizontal line, which can be adjusted up or down, to ensure that I align my next inserted vocal at the point the music reaches the same level.