Since the stretch of octaves is perceived and not measured, the tuner decides which octave desires kind of octave stretching "by ear". Good tuning demands compromise amongst tonal brilliance, accurate intonation, and an awareness of gradation of timbre with the compass from the instrument. The title of the modification with https://miloyqblx.thezenweb.com/the-5-second-trick-for-piano-tuning-service-68785513