Mark, I recall reading somewhere that the minor 3rd should beat about 1.7 times as fast as the Major third that starts on the same note. (ex: 1.7*A3C#4=A3C4) Is this equivalent to your statement that m3 should beat the same as the M3 5-7 notes above, depending on the piano's scale? (ex: A3C4=D#4G4 for medium scale)
Also, what range of the piano is this good for? Does the M3m3 test break down outside the temperament?
Original Message:
Sent: 02-05-2016 13:19
From: Mark Cerisano
Subject: Efficient Piano Tuning
[Edited Feb 5 @ 4:42 ETD]
Thanks for all the comments.
I apologize for the vagueness. I will try to explain.
When I started tuning, I used the method most people start with; cycle of fifths with landmarks along the way. (F3A3 = 7bps, the White Anchor, etc)
Then in 2006 I started teaching piano tuning. I was frustrated that I couldn't answer questions like, "How much faster should F3D4 beat compared to F3A3 when tuning a wide P4? My response? "Not too fast??" These answers did not make me feel like such a good teacher.
Also, as my ear got better at hearing beats and small beat speed differences, I became aware that the piano was laughing at me. That's right, the piano was actually laughing at me. Perhaps you recognize the sound:
"Ha ha ha. You set that beat speed to what you are sure is the best for this piano eh? And now you come back and it's changed? Ha ha ha. Now you're refining it? I can't wait for you to come back later and check it. Loser!"
I was getting really ticked off at how much refining I had to do. I decided to find out, if I could, what was going on.
I started writing programs to test assumptions and graph curves. I learned about inharmonicity formulas. I designed methods to accurately measure beat rates. I enlisted the help of other technicians through online audio surveys. I am writing articles for the Journal and taught two classes in Denver.
The result is now I have an aural method that I am very happy with, a very accurate, precise, and efficient method. But I am getting little or no favourable response from other technicians.
This post was an attempt to find out why. One question that I am asking is, "Do technicians generally not use the m3/M3 test, and that is why my method is too foreign?"
My experience talking to many techs is that the vast majority use ETD's. Even the ones who can tune aurally. Why? Most techs acknowledge that experienced aural tuners can do a better job than an ETD in many cases. The PTG remains adamant that an aural skill be kept as part of the exam.
My answer? Current aural methods are not easy to learn. There are too many vague ideas that are not at the root of the problem. My March article deals with one of these assumptions specifically. How many techs will ignore my research and say it doesn't matter? How many other aspects of my method "don't matter"? At some point, does all this "doesn't matter" add up to one BIG MATTER!
One assumption I used to believe: Put the pitch "close" and then do a lot of refining. Like the old comment "A piano has to be in tune before you can tune it."
One effort I've made is to figure out what that final pitch is, set it at the beginning, and try to reduce as much as possible any reason why that pitch might drift during the tuning. I am very close now.
In determining the final pitch of a note, I needed the m3/M3 equality.
Here's an example:
1. Tune A4 from Fork
2. Tune A3A4 (Get the octave spread and hence, the m3/M3 equality from that)
3. Set F3A3 approx. 7bps
4. Tune F3F4 (Confirm octave spread and m3/M3 equality. Not always the same on poorly scaled pianos)
5. Set C#4 so F3A3<A3C#4<C#4F4 changes smoothly.
Aside: Try my online test for tuning C#4 this way: Beat Speed Difference Ratio Test
Howtotunepianos |
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Beat Speed Difference Ratio Test |
Contiguous Major Thirds/M3's Skeleton Test Contiguous Major Thirds/M3's Skeleton Test When tuning contiguous major thirds, that is, major thirds that share a note, easily imagined as an augmented chord such as F3A3C#4 for example, the beat speeds of these thirds in equal temperament change about 26% from one to the other (when no inharmonicity is considered.). |
View this on Howtotunepianos > |
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6. Check A3C#4<C#4F4
7. Change F4 if it is not
8. Retune F3 from F4
9. Check F3A3<A3C#4<C#4F4
Now I use a Bisecting Beat Speed Window temperament sequence. (See the June Journal) All beat speeds are set exactly between two others. In this way, there is no guessing at where the pitch needs to be. Just set the beat speeds to be Slow-Medium-Fast, where Medium is exactly between Slow and Fast.
10. Tune D4 so that F3A3 < F3D4 < A3C#4. This is using G3B3 = F3D4 and setting up a F3A3 < G3B3 < A3C#4 eventuality.
Now comes the m3/M3 equality that bridges the F3A3C#4F4A4 to other parts of the temperament.
Assume we have a small octave spread AND we have tuned the F3F4 and A3A4 as a pure 4:2.
This sets up F#3A3 = B3D#4
11. Now I tune F#3 so that A3C#4 < F#3A4 < C#4F4. F#3A4 = B3D#4 sets up the eventuality of A3C#4 < B3D#4 < C#4F4.
I can also check the size of F#3C#4 just to be sure.
The entire temperament is finished this way. I have discovered reasons why these pitches drift, and have done my best to reduce their effect. (Who's laughing now, eh?)
The result is a progressive temperament, from which a stretch can accurately be chosen and applied.
(This brings up another confusion of mine. Why do people think the size of the temperament octave affects the stretch? Look at the Rails Back curve. There is little to no evidence of stretch in the temperament octave compared to the extremes. Choices you make WHILE tuning the extremes is what determines the stretch.)
Sorry for the long winded post. I just have no idea how to explain these findings in less time. I am expecting criticism.
I am available for an online Skype meeting for anyone really interested in this stuff.
You can also text me at 514-978-8637
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Mark Cerisano, RPT
http://howtotunepianos.com
Original Message:
Sent: 02-05-2016 05:05
From: Leif Mathisen
Subject: Efficient Piano Tuning
Mark, your m3/M3 inharmonicity research and methods sound very interesting!
You should team up with Another Wiley from the Seattle Chapter, he's designing something in conjunction with that, I hope that's OK to say Anthony. :)
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Leif Mathisen
Original Message:
Sent: 02-04-2016 09:40
From: Mark Cerisano
Subject: Efficient Piano Tuning
William, the answer to your question is: I tune 10 pianos a day when I need the money or I have to, for time reasons. I don't do it all the time. That would be too much; it's a 12 hour day.
The post was to find other techs who are using a similar method to mine.
It is too involved to explain in a post but I wrote two articles for the journal last June and July and a third is coming out in March.
The m3/M3 equality I use depends in the inharmonicity of the piano.
I measure the inharmonicity aurally by tuning a pure 4:2 (when setting A3A4 and F3F4) and checking the 6:3.
The 6:3 will sound pure, narrow, or very narrow.
From online survey results of other techs, and my own preference, I've concluded that the best sounding octaves (beatless, imho) are the pure 4:2 for the pure and very narrow 6:3, and the narrow 6:3 sounds best with a wide 4:2. The ear is the judge as to what is narrow or very narrow. If a wide 4:2/narrow 6:3 doesn't sound as good as a pure 4:2/narrow 6:3, then that's a very narrow 6:3.
Pure, narrow, and very narrow 6:3's (that accompany the pure 4:2) correlate to a definition I have described as "the octave spread" which seperates the pianos into three inharmonic groups.
The three octave spreads for theApure, narrow, and very narrow 6:3 I call: Small, Medium, and Large Octave Scale.
Here's where the m3/M3 comes in:
A pure 6:3 in A3A4 (Small Scale) means A3C4=C4A4
In Equal Temperament, C4A4=D4F#3
Therefore, A3C4=D4F#4
Similarly:
Medium Scale (narrow 6:3) produces A3C4=D#4G4
Large Scale (very narrow 6:3) produces A3C4=E4G#4
Using an appropriate m3M3 equality allows me to set and use the other contiguous major thirds (I call Skeletons) where they are supposed to be.
The result is less refinement and less guessing.
You can read more on my websie.
Disclaimer: I sell courses but there's tons of free stuff there too.
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Mark Cerisano, RPT
http://howtotunepianos.com