You could try the Audio Processing plugin
although that wouldn't necessarily be the best approach.
Start with trying to fix your files with MP3Gain (assuming they are MP3)
Keep a copy (just in case) but I've not had any trouble with this.
Read CAREFULLY about what it does as you may or may not wish to treat files as collected into albums.
Some of our Recorded files are coming out very low..I'm trying to assign Brakeaway to it to stop it but I don't know how
Can anyone help please??