Goldwave is used for converting file types and for leveling and detailed correcting.
For leveling a dj set I only add a few dB (like 2 or 3) based on sight, and then apply a brick wall limiter at -0.3 dB.
I'm very careful when mixing and set my gains, this way I don't need to "fix" things afterwards.
I also use it to remove some small errors, like when I pressed pause on the wrong deck :)