Re: Line Out

The only applications I've seen for 4-conductor mini plugs are two:
 
1)  A four conductor metal jack on my iBook which, with the right  adapter 
cable, gives Video out on the tip, left and right audio on the first and  
second 
rings, and ground on the sleeve
 
2) Mini jacks where there are three metal contacts for analog TRS mini  
plugs, but when a longer plug is inserted the same jack serves as an OPTICAL  
digital input.
 
Might the latter be the case in the drawing you're looking  at?


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