Sound Editing and Splicing

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For those of you that have edited dialogue in your mods, what program do you use to crop and combine dialogue lines? I'm not sure if I currently have a sound editing program on my computer, and I'd like to get the best one I can. Thanks to all that respond!
I dont do stuff like that, but I know Audacity is a good program for audio editing. I use it occasionally

Is it free?
I second Audacity and yes it's free.
@DouglasColvin @duckdotexe

Thanks for the suggestion! I'll try it out.
Try ACID Express its really good for trimming and it's free