Registered Piano Technician, RPT . An RPT is required to pass a series of rigorous exams on the tuning, repair, and maintenance of pianos with the Piano Technicians Guild. Services offered:Expert tuning, repairs, tonal voicing (for a softer or brighter sound), regulation, cleaning. Full Service Technician. User of pocket RCT! ( the most advanced visual tuning device on the inner planets. Tuner for countless homes, concerts, venues, recording studios, USC Thornton School of Music. Servicing pianos in Los Angeles and surrounding locations for 26 years.