Setting up the "Bach/Lehman" temperament completely by ear on the OPL Digital Harpsichord. Derive all 12 notes needed to make music from one reference pitch, then tuning by thirds and fifths.

A demonstration of my new OPL Digital Harpsichord. The song is Book 1 Prelude 1 of J.S. Bach's "The Well Tempered Clavier". The sound is generated by the Yamaha OPL3 FM-synthesis chip. An ersatz