It works… I guess
As a audio engineer in live sound and a musician, I can hear and distinguish a lot of distortion and noise coming from each track, even before they are separated. In short terms, audio quality is not good. When you start separating the quality of audio gets worse and worse. The piano is not identified in the music so soloing the piano is useless. The bass is extremely distorted and you cannot even hear the notes or the fact that it’s a bass. The drums are not great quality, and the main music track is eh. The vocal track could also use some work to create better quality. I’d say this app is alright, but for somebody looking for a really good quality, either backing tracks or practice track, there are better options. Like Moises, a free vocal and instrument splitter that has excellent quality!