Any software to quickly edit audio tracks before importing to itunes

Are you saving the audio from the files in mp3 format?
If so, try this:

MP3 Trimmer:
http://www.deepniner.net/mp3trimmer/

What sets MP3 Trimmer apart "from the rest of them" is that it can trim mp3 files while still in native mp3 format.
This means no converting of the files to another format (such as WAV or aiff), and then re-converting (and re-compressing, resulting in audio information loss) BACK TO mp3.

 

Easy with ffmpeg. Use "-t" option in secons for the duration and "-ss" in seconds or timestamp to set the start time offset.
Examples:
Trim starting from 10 seconds and end at 16 seconds (total time 6 seconds)
ffmpeg -i input.mp3 -ss 10 -t 6 -c:a copy output.mp3

Trim from timecode 00:02:54.583 to end of file
ffmpeg -i input.mp3 -ss 00:02:54.583 -c:a copy output.mp3

Trim from 00:02:54.583 for 5 minutes
ffmpeg -i input.mp3 -ss 00:02:54.583 -t 300 -c:a copyoutput.mp3

 

For that simple purpose, you don't have to install any software. There is a working online solution.

 

I just use Audacity for that stuff.