After my earlier post about tuning the Omega to the EBVT III temperament, I felt that something wasn’t quite right. So I consulted Ron Koval (RonTuner) and he gave me a fantastic tip about the correct use of Verituner’s ‘coarse’ and ‘fine’ tuning modes.
For a new tuning (i.e., new temperament/stretch) you must use a two-pass approach. The first pass is with Verituner in ‘coarse’ mode. This allows Verituner to dynamically recalculate the stretch for the whole piano as the IH for each note is acquired. For the unisons you just need to coarse-tune one of the strings.
The second pass in done in ‘fine’ mode, where VT locks in the final inharmonicity data for each note. It is now much easier and faster to get each string to 0.0. The only really difficult notes were all at the top end of the keyboard.
The coarse tuning needs to be done only once. Thereafter all re-tunings and touch-ups of individual notes are done in ‘fine’ mode.
When I re-tuned the piano with this 2-pass regime, I found that I had to tweak most of the notes. They typically off by about 4 – 5 cents.