songmastr mastering AI. Make your songs sound (almost) as good as your favorite artists. By using this service you can automatically master any song (wav or mp3) to a reference track uploaded by yourself. This service is free up to 7 songs per week. This service uses artificial intelligence and is based on the open source library matchering. The algorithm masters your track with the same RMS, FR, peak amplitude and stereo width as the reference song you choose.