Thanks for the inquisitive responses. The text was written in 1966 and belongs 
to a composer from the circles of the BBC. It reads:

"[one person] controls the volume of the total output of the platform speakers, 
as well as the stereophonic motion of the sound to and from between the 
loudpseakers, and the spread or growth of the sound from audio-point to audio- 
plenum"

For me it seems as if he would be describing some kind of potentiometer by 
means of which the user can control the spread of sound among the stereophonic 
image. Even if this person was far from being a consummate technician, he was 
curious and intelligent and I would be surprised if he would have invented this 
term. I would rather be inclined to think that he might have heard it from 
someone among the circles of the BBC, or perhaps seen it written on a piece of 
equipment. 

Thanks for your comments

Gregorio Garcia Karman
ggkar...@musicologia.com



On 16.04.2012, at 15:29, Dave Malham wrote:

> I have to say I don't hear any bells ringing - and I'm (almost) from that 
> era. Like Ronald said, a scan of the passage might help...
> 
>     Dave
> 
> On 15/04/2012 10:07, Gregorio Garcia Karman wrote:
>> Dear sursounders,
>> 
>> I found a reference in a musical text of the 1960s originated in the UK that 
>> mentions the terms "audio point" and "audio plenum" perhaps in reference to 
>> a technique that would be able to control the spread of a single source in 
>> the stereophonic image. Do these terms ring the bell of anyone here?
>> 
>> Huge thanks and best regards
>> 
>> Gregorio Garcia Karman
>> ggkar...@musicologia.com
>> 
>> 
>> 
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> 
> -- 
> These are my own views and may or may not be shared by my employer
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