8-pin 6.5mm headphone connector pinouts are needed

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Hello everyone,

I have a Sound Appeal SA-100T class D amplifier (Tripath TK2050 chip), which uses an 8-pin 6.5mm headphone connector. I want to modify the amp by adding a switch that would allow me to switch between headphone and speaker output without having to unplug the 6.5mm connector. Unfortunately, this is the first time that I am seeing an 8-pin 6.5mm headphone jack and I am not sure how to proceed.

Does anyone have any suggestions and/or pinouts for this kind of connector?

P.S. Picture is attached.
 

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