Audacity
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Full user review
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"Not recommended if you have aggression issues"
Pros
Comes with great tools and effects for free software.
Cons
Absolute nightmare to use. I'm not exaggerating either. You will get so frustrated using Audacity. Trying to manipulate audio stuff in it is like trying to juggle a fish, and jello at the same time. I basically use it to apply one thing at time, like change tempo function. If I have to do anything else, I have to take a stress relief course afterwards, or an anger management course. It would be so much better if they had grid lines in the playlist, as well as snap-to function for it.
Summary
Great effects for free software but absolute nightmare for extensive work.