When Ric tunes A4 and E6 to the very same Tunelab setting, then A#4 and F6, and so on up the keyboard, he is guaranteeing perfect 12ths. When you only use 3:1, you are relying on the TL math to be precisely spot on, which it often isn't. (That is, the math is fine but the calculation of the inharmonicity constants, based on five or six readings, is a close approximation often off by a few cents in the upper ranges. You can verify this yourself: when you get up to say C7, play the note F5 and see if the blocks remain still. If so, TL has given you a perfect 12th. More often than not, the blocks will move.) <div class="gmail_quote">On Tue, Mar 25, 2008 at 5:43 AM, Cy Shuster <<a href="mailto:cy@shusterpiano.com">cy@shusterpiano.com</a>> wrote: <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Ric, What's the difference between this approach, and just setting the octave styles to 3:1 12ths in both bass and treble?  I've tuned this way. --Cy-- ABQ, NM <div> <div></div> <div class="Wj3C7c"> ----- Original Message ----- From: "Richard Brekne" <<a href="mailto:ricb@pianostemmer.no">ricb@pianostemmer.no</a>> To: "Pianotech List" <<a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a>>; <<a href="mailto:caut@ptg.org">caut@ptg.org</a>> Sent: Tuesday, March 25, 2008 3:58 AM Subject: Pocket PC Tunelab tuning > Hi folks. > > Finally got around to figuring out how to do a P-12 tuning custom sampled > for each individual piano using Pocket PC Tunelab.  Havent gotten around > to it yet as I rely so much on my ears that a generic version has > sufficed... but got to dinking around and have a nice solution for any of > you who are interested. Heres what you do : > > First go into the partial table and set all partials from A1 to E6 to the > 3rd partial. Then set your tuning priorities to 6:3 for the bass and 3:1 > for the treble.  Then set the thing do fully automatic.  Sample  A1, D2, > A2, D3, A3, D4, A4, D5, A5, and D6 for inharmonicity. Check your > inharmonicity constants table so that there are no other notes in it then > these.  Thats about it.  You should see that the bottom tuning deviation > curve is pretty much flat. > > When tuning, I always tune 3 notes for notes D3 to D4.  Namely the octave > below and the 12th above in addition to the note on the display. From D4 > upwards tune the 12th above in addition to the note on display and check > the octave below until I hit A4.  From there up its just the note on the > display and the 12th above. This allows for an overlapping check for all > notes from A4 upwards as I've already tuned them referencing the 12th > below.  Since tunelab calculates a pure 12th curve there will be no real > difference in target frequencies. > > I finish off the lowest bass octave by tuning G#1 downwards with octave > above on the display, finally checking with the actual note on the > display. > > Cheers > RicB > > > > > </div></div></blockquote></div> -- | || ||| || ||| || ||| || ||| || ||| || ||| || ||| jason's cell 425 830 1561