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To help you choose the most suitable solution for your needs, in the following lines we briefly present some of the highest-quality and most popular programs.
Audacity
Audacity is perhaps the most widely used free audio editor. It is open-source software and offers options for basic recording as well as high-quality editing. It is used by many users who have built a supportive community around it.
Ocenaudio
The user interface of Ocenaudio is logical and easy to use. This program is suitable for people who, in the course of their work, need to edit and analyze audio files quickly and without extra effort.
Presonus Studio One
Presonus Studio One has two versions: free and paid. The application offers a wide range of functionalities, which makes it a little more difficult to use for people without experience with similar programs. But if you learn to work with it, you will be able to process your audio files like professionals.
TwistedWave (beta)
TwistedWave is an online tool. It allows you to download and edit audio files from Soundcloud, and you can save the resulting files in Google Drive.
Wavosaur
Wavosaur is also a free tool. With it, you can process files in wav and mp3 format. The software does not require installation or registry entry.
Of course, you can find many more audio editors on the market and across the internet, but these are some of the most preferred ones. In addition, they can be used for commercial or business purposes.
Source: http://www.articulate.com/rapid-elearning/7-free-audio-editors-e-learning-courses/ .