As the volume levels are different there are adjustments that can be able to enhance the way it sounds. The thing that can be fixed is the amount of electricity coming in. This is done by changing the dBs coming in and it changes the volume. By doing this, the volume can be matched and all the tracks sound the same when it come to volume. One thing that cannot be fixed is the quality of the actual recording. If one track is recorded with more "noise" there isn't really much that can be done to make it as crisp as a track that sound much better. The optimal level record is right in the middle of the dBs so that it there isn't much background noise but there you can still hear it in good clarity.