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'TUNING' - Generally encompasses all Tuning, Voicing and Regulation.
Tuning involves adjustment of the pitch of the instruments strings to a 'tuneful' sounding instrument (at A=440) and requires an extremely skilled and properly trained, dedicated workperson. Other aspects of regulation and voicing involve maintaining the efficiency and responsiveness of all the 'action' components in the instruments assembly and bringing out the very best tonality the piano can produce.
For a complete comprehensive service a professional Piano Service Technician is recommended and can be found nationwide by searching the Piano Tuners And Technician's Guild (PTTG NZ) http://www.aptta.org