mp3Trim ma obmedzenie velkosti stopy a dalsie obmedzenia pri bezplatnej verzii. Ja to velmi nepouzivam, ale existuje na to iny bezplatny program, ktory na to ide inak, lepsie(?):

http://mp3gain.sourceforge.net/

MP3Gain does not just do peak normalization, as many normalizers do. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear.

Samozrejme operacia prebieha bez rekompresie / straty kvality.