PIANO TUNERS EAR

By tuning beat rates to highly accurate criteria we can produce extremely accurate treble notes that sing, we can produce consistent equal temperament, and we can easily tune pure unisons and know when they are not stable, all by being able to easily hear the beating of any interval... Introducing the first ever Piano Tuners Ear! Now you can hear exactly what professional concert level piano technicians hear (and what some can't!) with the flip of a switch and a turn of the dial. How can I say that? Well, because I invented it and I am a concert level piano technician and when