FWIW, this is the description of GEN13 in the Music360 manual:

GEN13

This routine simply stores 512 values along a monotonic curve, like GEN01; 
but in this case only the first and last values are specified and 
interpolation is made according to the sone scale of amplitude relationship. 
This scale was devised by S.S. Stevens, and is described in his article "The 
Measurement of Loudness" in The Journal of the Acoustical Society of 
America, Vol 27, No. 5, Sept. 1955.) Thus GEN13 may provide a better 
approximation to perceived loudness than GEN01 or any other GEN-subroutine.

P4 and P5 specify the initial and terminal values, and all other parameter 
fields are ignored.


Art Hunkins

----- Original Message ----- 
From: "Richard Boulanger" 
To: 
Sent: Thursday, December 04, 2008 12:56 PM
Subject: [Csnd] Re: low frequency oscilators


> Everything from Barry Vercoe's Music360 should have made it to Csound?
> Curious.
> Maybe it can be resurrected?
>
> -dB
> On Dec 4, 2008, at 11:56 AM, Art Hunkins wrote:
>
>> The curve that relates perceived loudness to frequency is the 
>> Fletcher-Munson curve.
>>
>> Another curve I'm particularly interested in relates amplitude to 
>> perceived loudness: the sone curve.
>>
>> Looking it up in my old Music360 manual, I found (recalled) it was  GEN13 
>> there. A pity that routine didn't make it into Csound. I used  it 
>> regularly, and continue to do so by approximating it with GEN16.  This is 
>> the table I read:
>> f1 0 512 16 1 511 2.2 1000
>>
>> Art Hunkins
>>
>> ----- Original Message ----- From: "Chuckk Hubbard" 
>> > >
>> To: 
>> Sent: Thursday, December 04, 2008 10:24 AM
>> Subject: [Csnd] Re: Re: Re: Re: Re: low frequency oscilators
>>
>>
>>> On Thu, Dec 4, 2008 at 12:37 AM, Richard Dobson
>>>  wrote:
>>>> Andres Cabrera wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Also be aware that ears are not linear in their relation of  amplitude
>>>>> and frecuency, i.e. different frequencies at the same amplitude  will
>>>>> be heard at different loudness.
>>>>>
>>>>
>>>> And further, that  the same tone at different loudnesses  will be 
>>>> heard at
>>>> different pitches, e.g. louder-->flatter, quieter-->sharper.
>>>>
>>>> Richard Dobson
>>>
>>>
>>> I've heard this in reference to the extremes, towards the higher and
>>> lower ends of the audible spectrum; I forget the name given to it,  but
>>> I've verified it myself with several-kHz tones, changing the  amplitude
>>> and hearing a pitch change.  I'm not sure how strong it is in the
>>> mid-range, I can't detect it so much.
>>>
>>> -Chuckk
>>>
>>>
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>>
>>
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>
>
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