Would it be possible to be able to adjust the level of the left an right volumes independently. I master my backing tracks and I get them very close in level to each other. This works great so that it is "set and forget" for the most part since I am mixing the band from the stage. However occasionally I need to make an adjustment. The click I can always get that to be pretty much exactly the same on every song. And I would like to leave that untouched when I adjust the music. Thus why it would be great to do it independantly!