Audio files such as .wav, .flac, etc. Please note that the result depends on the source file.Sometimes cleaning an .mp3 file may worth it, but if you have a better quality audio
file it will result in a smoother cleaned file
Audio of a video file taken with your camera or your mobile phone
Audio of your podcast material
Professional voice-overs (narrations, audiobooks)
Seminar recordings
Conference audio
Audio on your YouTube videos, so your business will look more professional
Old, transcripted records, as old tapes or vinyles