Down to 4 bars left!

Just a quick, text only note: There are only 4 bars left to tune, the 4 lowest ones! Tuning the last octave, I've found a really quick way to double/triple tune a bar, within 30 minutes maximum! I'm thinking about making a movie of one of the last four bars...so you can believe me.

Here are the steps:

• Remove 6mm material between calculated beginning and end of arc.
• Remove another 3-4mm in the center right away.
• Measure: The bar should have 3 nice spikes. f0 and f10 already quite close, f4 way to high.
• Tune down f4 by removing material in 0.5mm steps from the position of f4 towards the center. Keep an eye on f0 and especially on f10. This creates a step of approx 3mm down from the first 6mm. If f10 gets close, stop extending the f4 area towards the center, keep it closer to its core area.
• When f4 is almost right (say 1-3 cent up), tune down f10 and f0 in the center. Measure often, watch f10 closely, and f0.
• When f10 is right, and f0 is still too high, scrape at approx 2cm left and right to the center. This brings down f0 only, and does almost nothing to f4 and f10.
• Here you are: You've just triple tuned a bar in no time at all, typically 30 minutes.

You'll see that in the upcoming video. The locations are all taken from Bork's paper and the graph of the regions of influence for the f0, f4, f10 and f20. The graph really is like a map, which provides orientation on the unknown bar.

Next up: Video, sound samples! Stay tuned!