•Craig Brougher's comments ascribe acceleration in computer-playback performances to be due to losing the speed drop during playback produced by wind motors. It may well be true, and is an example of the fiddling little details you have to consider in a simulation, but is surely at worst a marginal ...

•I appreciate Robbie taking the time to clarify what he meant about Ampico and Duo-Art tempo regulation, and how perfectly satisfactory they are to him. (I'm having some fun with this right now -- don't take it seriously). Robbie said: " Both my Ampico B and the Duo-Art pumper have excellent motor-s...

•Hi folks: The acceleration talk has been intriguing, and presents a quandary to the roll creator. Richard Brandle's "WIND" program for roll editing/creation now compensates for acceleration upon MIDI import. I've tried it with two new rolls: "Long and Gentle" by Robin Frost (released, so far, only ...

•Hi all Just one thing I would like to add on the subject of Music Roll Acceleration. In the case of the common player piano, The wind motor and transmission will compensate for roll acceleration to a certain degree due to the physics of the motor and transmission. For example: If a long roll is pla...

•May I respectfully suggest that a defined diameter of take-up spool be settled upon. The fact of the matter is that take-up spools are not all of the same dimensions. The larger the take-up spool is in diameter, the less acceleration there should be from the beginning to the end of a roll being pla...

•When making my "O" rolls I used this method to figure out the paper speed at any given point in the roll. There is approximately 250 feet of paper, maximum, on an "O" roll. I used a rotary measuring-wheel counter (it displays in feet or inches) and measured the distance and time from start to finis...

•For those interested in calculating how fast their rolls would be going after some paper buildup, here are Rex Lawson's calculations from Player Piano Group Bulletin 138 (Autumn 1996): If C = circumference of take-up spool (and C2 is circumference squared) L = length of paper rolled onto spool c' =...

•There was an error in my note yesterday -- I left out the length of paper in the final equation! For "4 pi t", read "4 pi L t". I've been asked to clarify it anyway, so here goes... All you need to know to calculate acceleration in a roll is the length and thickness of the paper that has been rolle...

•I am working furiously on a new issue of Duo-Art music for the PowerRoll and MIDI pianos. I hope to have another 200 or 300 files available soon. An issue has arisen and I would like feedback from MMD readers regarding their opinion. When making the MIDI files and BAR/ANN files from the original pa...

•Hi All, Regarding Spencer Chase's question about accelerating the tempo of MIDI files and BAR/ANN files to reflect the typical 'real-time' operation of a popular music roll being played on a well-restored regular player piano, my opinion is that the MIDI files and BAR/ANN files should be "error fre...

•When listening to pop tunes I prefer constant music tempo, and so I usually diminish the paper speed as it plays. Otherwise the speed increase is noticeable, with both electric motor drive and with well-governed air motor drive. Dance bands try to play at constant tempo, so I assume that the pop mu...

•I bought a Melville-Clark Apollo about a year ago. Its my first and only player piano. I've noticed while playing rolls, especially larger rolls, that the tempo is quite a bit faster near the end of the roll than at the beginning. It's so pronounced that I find myself decreasing the speed of the ta...

•Hi All, Just wondering if I have failed to regulate something properly on my Duo-Art grand Tempo governor. The larger the roll being played, the more the tempo increases as the roll plays (which is logical due to the increase in the size of the take up roll). Is there an adjustment which I have fai...

•Following Craig Brougher's article in MMDigest 981104 I commented: >[ Some pop songs bother me when the music accelerates, and some >[ songs don't. Both my Ampico B and the Duo-Art pumper have excellent >[ motor-speed regulation, and the effect is the same with either piano >[ -- I find that I slow...

•There has been much discussion recently about whether piano hammers can accelerate after they have been released to fly freely at the string. First the definition of acceleration. Acceleration is defined as the rate of change of velocity. Both velocity and acceleration are vector quantities; this m...

•Roll acceleration is easy to do if you try to do it. It's a linear factor of the length of paper wound onto the spool; if the spool turns at a fixed rate, the circumference of the spool increases by the amount of paper built up. The factor for a typical roll is about 0.01% per linear foot. Some par...

•[ Re "Music Roll Acceleration" in MMDigest 981106 ] Oh that was a good one! Spencer Chase at least reads my stuff! When I saw that, I cracked up. Well, haste makes waste, I see. So in case anybody else wonders what I do with my ".120 thick pouch leather", I just tell them I substitute it sometimes ...

Janosy and Macsai seek Welte-Mignon player acceleration/deceleration data for their project of reproducing the music from the transcribed rolls, using a Welte-to-Midi emulator and a synthsizer or Disklavier. Virtually all classical rolls include inherent time correction which attempts to compensate ...

•On the discussion of hammer acceleration and let-off, Roger Waring wrote "Despite the absence of direct human control at the point of impact however, surely if you strike the key hard enough initially, you can generate enough potential force to result in continued acceleration beyond set-off." Sorr...

•I don't remember much physics, but I do know that acceleration requires force. If you have disconnected the force (once the jack escapes) you can not accelerate the hammer. The only way it could accelerate is by a force acting on the hammer. The only force remaining is air drag. This would decelera...