An update to my previous review: I now use GoButton on an iPad to control all of my sound cues on both my traveling gigs and my weekly stage show. And for someone like me who has backups to his backups, It is a dream to have a backup in my pocket (on my iPhone) should there be any problem with my regular show iPad. The show uses some 30 cues, some played simultaneously, with variable play lengths and fade-outs, and GoButton does the job. I recommend GoButton to every performer I talk to without reservation.