I don't think I have commented on this thread, but back in 1975, 
I had a HamAm rotor that turned my HighGain TH6DXX 6 element 
beam.  There was no way for a blind person to know the direction 
the antenna was pointing because the rotor meter was of course 
under glass and probably had a very small needle.  A friend at 
the time, built a small device, seems it was a voltage controled 
oscillator with a pointer knob on top that rotated freely 360 
degrees.  I would set the pointer in the direction I wanted to 
point the beam and hit the keys on the rotor.  When the tone in 
the speaker inside the attached box nulled out, I knew I was 
pointing northwest or where ever I needed to point.  I am not 
aware of any similar audible rotor indicators out there today.  
Jim WA6EKS