Barjan Roger Beep Echo Mic
 

I Just picked one up on eBay, without instructions or schematic.
Barjan says it knows nothing.

(1) Anyone have instructions to fax or email?
(2) Can the beep be modified? It is now very soft and high pitched.
(3) What are the two pots for on the PCB?
(4) How is the "receiver control" mic lead generally used?

Ken C