I am trying to fully understand the following circuit and have some questions about it. Some preliminary info is that this is an audio voltage amplifier specifically for guitar use. Now overall, it looks like a run of the mill common source amp but it has a variable source resistor and also the gate is biased via a divider being fed the drain voltage. The DC drain voltage of course changes as the source resistance is changed thus changing the gate bias voltage.
What is the benefit of biasing the gate like this? Wouldn't feeding the gate voltage divider the 9V supply to keep the gate at a constant 4.5V work just as well? It seems the FET would still remain in saturation this way.