Hey guys, how does this process work exactly? I've recently found someone who can master my tracks. How do engineers do this? Is the MP3 of the track all you need? And is it better to lower the volume on everything for my final mix before I give it to an engineer? I've heard horror stories of engineers recieving tracks, and the volume of the drums or bass can be so high that the engineer can't do anything with the track, and it ends up sounding like crap.