Audacity is free, open source software for recording and editing sounds. This is a really useful program if for example you want to trim an mp3.
Audacity can record live audio through a microphone or mixer, or digitize recordings from cassette tapes, vinyl records, or minidiscs. With some sound cards, it can also capture streaming audio.
Import sound files, edit them, and combine them with other files or new recordings. Export your recordings in several common file formats.
Easy editing with Cut, Copy, Paste, and Delete.
Change the pitch without altering the tempo, or vice-versa.
Remove static, hiss, hum, or other constant background noises.
Record and edit 16-bit, 24-bit, and 32-bit (floating point) samples.
Record at up to 96 KHz.
Sample rates and formats are converted using high-quality resampling and dithering.
Mix tracks with different sample rates or formats, and Audacity will convert them automatically in realtime.
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