I've got 2 albums ripped and I want to cut all the songs down to just the first 30 seconds. I'm playing with Audacity, which I see I can use to do it one song at a time... but do any of you know a way to do it to all the files in a folder all at once?

Doing a little searching I see that batch processing is called 'chains' in Audacity: Batch Processing - Audacity Manual