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Need explain of this jfet schematic please? Answered

Hello . i need help with this jfet shcematic .How to caculation thi gain of the jfet , and how to reduce the gain ??
Thanks in advance!
sorry for my bad English!

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login721
login721

Answer 8 years ago

This is the DIY irig for iphone, it's dont need DC source because the ipod will provide it .The main aim of this circuit is make hiZ input for guitar and lowZ output for ipod mic input.It also reduce the electric guitar signal (~400mv) to 30-50mv for ipod.Thats all i know.
The problem is i want to reduce the signal a little bit by reduce the gain of jfet to avoid clipping when i use humbucker pickup.
Thanks!