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I've been able to do a lot of fairly fiddly things with Audacity -- splicing pieces to edit them down to length while maintaining the original structure, and so on.
You can find tutorials online to show you how to do all these things.
I doubt there's anything objectively "better" out there for your purpose, although you might find something with an interface that you prefer. In the realm of software, price doesn't necessarily correlate with anything at all.
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