I like this app because it allows me to practice songs on bass with a full band. You can cut individual tracks to play your instrument and you can isolate your instrument to listen to how that piece is played. Operation is pretty straight forward. Now the BIG!!! drawback, very expensive to purchase tracks! We are talking $17 a song, this make it cost prohibitive as sometimes I need to learn 4-5 new songs a month in my position as a worship team bass player. Maybe this will come down as more people begin to use it.