DOB is a feature found on the Sanderson Accu-Tuner III and IV. (See: Page 30 of the 2011 SAT IV Instruction Manual.)
DOB allows the technician to expand or contract the stretch of the memory tuning and can be used where ever more or less stretch is needed.
DOB does not affect A4 but does affect every other note on the piano.
A positive DOB setting increases the stretch of the memory tuning by raising the notes above A4 and lowering the notes below A4.
A negative DOB setting reduces the stretch of the memory tuning by raising all notes below A4 and lowering all notes above A4.
DOB is an adjustment of the double octave’s beat rate, in tenths of a beat.
A .1 DOB setting increases the stretch, widening the double octaves by .1 beat per second.
A .5 DOB setting will increase the beat rate of the double octaves beat by about ½ bps.
The maximum DOB setting (positive or negative) is 2.0 which increases or decreases the widths of the double octaves by 2 beats per second.
When using any memory tuning template with the Sanderson Accu-Tuner III or IV, DOB makes it possible to modify the stretch ‘on the fly’,
anywhere in the scale, during the tuning process.
Here are a few guidelines as to how much DOB will affect the placement of A3 and A5 (in cents):
.1 (of a beat) DOB @ A5 (or A3) will move A5 (or A3) .2 cents.
.1 (of a beat) DOB @ A2 (or A6) will move A2 (or A6) .4 cents.
.1 (of a beat) DOB @ A7 will move A7 .6 cents.
.1 (of a beat) DOB @ A0 will move A0 .8 cents.
It is best to add or remove DOB incrementally to keep the tuning as smooth as possible. The cents buttons can be used to even further smooth out
any DOB ‘hiccups’ on notes above and below the roll off.
Bob, The piano sounds beautiful! I did some recording of it tonight. Suzanne
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Bob, Thank you for bringing my piano back to life! It sounds beautiful! Linda
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Hi Bob. . . Yamaha sounds fantastic! Great Job! Thanks so much, Carol & Wayne
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Bob, my piano sounds much better! I'm impressed with your ear and your knowledge.
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dear bob, just wanting to tell you, piano sounded great. yours is the best tuning I’ve had in years. let’s set up another time for some more magic.
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Hi Bob The piano sounds beautiful. Thank you. I’ll put you on the calendar for next year.
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Bob, I just wanted to tell you how wonderful the tuning job was, I never heard the piano sound better, either I am getting older and cannot hear or you are getting better, I think it is the latter. You...
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. . . the piano sounds great!
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Thank you, Bob, for the fabulous job you did with our piano. It sounds wonderful! Regards, Meryl Wade
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Thank you so much. We feel really grateful to have you keeping our piano in working condition. It’s so nice to have someone we can trust and who always does such a great job.
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Bob, I have owned the 1904 upright you recently tuned for over 50 years. I don’t know what magic you did, but I must compliment you! My sturdy old friend has never sounded better in all the years I have owned...
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Hi Bob. Thank you so much for the exceptional job you did tuning my husband’s old piano back on February 13th. He was thrilled and it sounds just gorgeous now! Best, Janet Mabon
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Thank you so much, Robert, for the wonderful job you did tuning my very old upright grand piano. Stopped playing long enough to write this review. You worked a miracle and what a thrill to hear those rich bass sounds...
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Just a note regarding my Schimmell grand piano. It sounds fantastic and bell like with very pure tone just like when I bought it. I played it quite a bit this weekend and as you noted one hears every note....
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Good morning Bob…….Thank you for sending the excellent report. It is well written, thorough and….well, perfect! You have mucho expertise when it comes to pianos…..we were lucky to have such a person….
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Very professional. . . . .
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My Hamilton console piano had not been tuned for over 6 years and moved from humid South Carolina to dry Tucson. So I called a friend, who plays the contemporary music at our church, and he immediately recommended Bob Conrad....
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Bob, your class at the Convention was amazing. Now I have a thirst for more. I am interested in your tunings for my SATIV.
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Bob is a great tuner. He has tuned not only my studio piano but those of my my voice and piano students. He’s more than just a tuner, he’s a fine technician as well. He’s a fine musician too, possessing...
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Bob did the best job possible tuning my piano which I had neglected for five years I am ashamed to admit. Thanks Bob it sounds awesome....
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