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Help With Calculations with J-fet

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Caissiejp

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This is my first tread, I hope I will find my answer. Thank you

I am currently working on a distortion pedal called Brown Sound In A Box 2.
Here is the link for the schematic.

https://www.electro-tech-online.com/custompdfs/2009/12/ggg_bsiab2_sc.pdf

I am having trouble with the J-Fet transistors calculation, espacially for Q2. I do not know the usage of it and the voltage at the Source. May somebody please help me?
-According to the link below, they say its 4.5 Volts but I can't figure out why .

https://www.electro-tech-online.com/custompdfs/2009/12/ggg_bsiab2_instruct.pdf
 
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