Re: Volume or Velocity Settings

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Re: Volume or Velocity Settings

jbeach2646
In January 2014, someone on the forum posted the following settings (“Percentage of Loudness”)  for the volume/velocity settings for specific levels of loudness to softness.  Since, in Midi, Velocity is calculated on the basis of 0 to 127 (low to high, as a setting in jOrgan for a specific organ stop footage) and Attenuation is calculated on the basis of the percentage of Attenuation from Zero (0) equals no attenuation, to 100 equals full attenuation, presumably, the values given below are to be interpolated in two different ways,  Velocity (0-127) and Attenuation (100-0).   Since both settings are parameter values in the Midi Specification,  and it is possible to set either or both in the Soundfont in either the Instrument Pool or the Preset Pool of the Soundfont tree, taking into consideration the volume/amplitude of the samples in the Sample pool of the Soundfont Editor (In Polyphone>Samples>Sample.wav>Tools>Sample>Change Volume), where all samples for all organ voices (stops) would have to have the same loudness setting in order for the settings given below to be relatively or relationally correct in the Instrument or Preset pools, what is the optimal loudness setting (In Polyphone> Samples) for all samples in the Sample Pool if the equivalent values for Velocity and Attenuation settings, given after the percentage of loudness, are to be effectively correct? 
 
“Volume or Velocity Settings ppppp to fffff: “        
Percentage of Loudness                    Attenuation Parameter Setting                       Velocity Parameter Setting
("sf" . 1.00)                                          0                                                                               127
("fffff" . 0.95)                                      .5                                                                               120
("ffff" . 0.91)                                       .9                                                                                115
(“fff" . 0.83)                                        .17                                                                              105
("ff" . 0.75)                                          .25                                                                              95
("f" . 0.67)                                           .33                                                                              85
("mf" . 0.60)                                        .40                                                                              76
("mp" . 0.53)                                        .47                                                                             67
("p" . 0.46)                                           .54                                                                             58
("pp" . 0.39)                                         .61                                                                             49  
("ppp" . 0.32)                                       .68                                                                             40
("pppp" . 0.25)                                     .75                                                                             31
("ppppp" . 0.12)                                   .88                                                                             15
 
 
How the Attenuation Parameter Settings were derived is the simple resulting percentage subtracted from 100 (1.00).  The Velocity Parameter settings are derived from multiplying 127 times
the .nn (n=number) percentage value in the Percentage of Loudness column above.
 
Thanks.
John Beach
 
 

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Re: Volume or Velocity Settings

John Reimer
Administrator
This post was updated on .
JohnB,

I sometimes lose my way in reading your long sentences, and I don’t really
understand what you are trying to tell us in your post. I don't think that
treating settings as a percentage is particularly helpful. To quote one
authority, our hearing  judges an increase  or decrease of loudness in a way
which is “roughly proportional to the logarithm of the ratio of the two
acoustical powers”. The commonly used unit is the decibel. An increase of 3
decibels means that twice the power is now present.

Having said that, it remains true that an increase of  3dB does not usually
sound to most people as if it is twice as loud. It is said that an increase
of 1 dB is “barely perceptible”, and 2 dB is only “slightly” perceptible.

I think that in practice all we have to remember regarding Attenuation
Settings in the soundfont parameters, and Velocity Settings in the jOrgan
disposition rank MLP messages, is as follows:
1. Increasing the Attenuation Setting by 10 (e.g. 20 to 30) lowers the
acoustical power by 4 dB. This applies to doing it at both the Instrument
level and the Preset level. (And 20 to 25 would be 2 dB, and so on).
2. Decreasing the Velocity Setting in the Rank messages to HALF its value
lowers the acoustical power by 12 dB.

These figures remain true over the whole range, in each case.

John Reimer





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Re: POSTING FORMATS

jOrgan - User mailing list
I understand completely. I have copied thousands of postings into dozens and dozens of folders on appropriate subjects for my organ research.

Don't know if it is a fault of the chatlist software, or simply that some folks forget there is a [RETURN/ENTRY] key on the computer keyboard to use between paragraphs.

I split up most posts into many separated paragraphs for searching files in subsequent retrieval.

Also, I must strip non-essential copy, although I always keep subject matter, URLs and poster e-ddresses should I need to contact the poster.

= = = = = = = =
It is necessary for me to copy in special form:
I highlight and copy desired text [CONTROL C in Windoze]

then paste as [ALT] [E] [S] [Unformatted Text (up-arrow)]
onto the page (over a highlighted 9-point "x" in TimesNewRoman)
(to avoid all large colored type that wastes color inks and space)

Exasperating at times, but when I realize how much specialized information this list provides at a moment's notice, I realize how blessed we are (today being Thanksgiving in the USA).

I have saved more than 20,000 pages of needed research at this point!

To create my 5-manual theatre organ requires skills beyond my humble knowledge.
I can pull it off with jOrgan and MidiBox, with valid comments I have saved.

It appears that jOrgan will remain after a troubled resurgence, so that is a good thing.

pk




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