This will save you several hours of serarching. All of them are open source or free as well as being easy to use. They work directly in mp3 format so there is no re-encoding and loss of quality issues. They are also fast.
mp3directcut : use this to do any additional trimming.
http://www.afterdawn.com/software/audio_software/mp3_tools/mp3directcut.cfm
mp3gain : use this to adjust the amplitude.
http://mp3gain.sourceforge.net/
mp3directcut : use this to do any additional trimming.
http://www.afterdawn.com/software/audio_software/mp3_tools/mp3directcut.cfm
mp3gain : use this to adjust the amplitude.
http://mp3gain.sourceforge.net/