editing MP3 files

After seeing Target advertising generic "record your vinyl to MP3" turntables for 99 bucks I have finally made the plunge and am about to convert my MOUNTAIN of trash '80s vinyl into something which I can play on noughties hardware.
I already have a utility for labelling MP3 files - MP3tag - free & does the job.
Now I need something for editing the MP3 files. Mostly for cutting out the pre-track and post-track bits, but possibly also for filtering some of the more abused tracks, ameliorating the vinyl snap, crackle and pop.
Can anyone recommend a good FREE tool?

I already have a utility for labelling MP3 files - MP3tag - free & does the job.
Now I need something for editing the MP3 files. Mostly for cutting out the pre-track and post-track bits, but possibly also for filtering some of the more abused tracks, ameliorating the vinyl snap, crackle and pop.
Can anyone recommend a good FREE tool?