Wiardgroup

> Interesting! I always associated the LPG with the Subotnick marimba 
> sound, but I hadn't thought of them (or Borg filters) for "spatial 
> localization and movement". Guess I should be reading old Buchla 
> brochures! Thanks for posting.

The effect is high frequency roll off over distance with humidity (adds friction to air).
That was the error in the speed of sound measurement variation that Newton never solved. It 
took 200 years after his death to figure it out (according to PBS).

The VCA (or Combo) mode is 6 dB per octave, probably average humidity. 3 dB / Oct would 
be dry air and 12 dB / Oct would be a visably foggy night (just guessing).

Also the 6 dB output of the Boogie can be used for the same effect.

To Summarize: Humidty forms a lowpass filter over distance in air. To simulate this effect in 
panning, use low pass gates (Borg, Boogie) instead of plain VCAs.