Even though audio files are not usually very big, it is always advisable to have a tool like MusicCut handy. It lets you divide large sized audio files into smaller fragments (ideal to do your editing and rip the part of the audio you like most).
MusicCut works with the following audio formats MP3, WMA, WAV, 3GP and AMR. Also, despite being called MusicCut, it also divides video files like AVI, MPEG, MOV, WMV, etc.
This way you`ll get the part of the video or audio you want from each of the files you cut using MusicCut.