hey i am trying to design a boost pedal for my guitar. here are the specifications i designed it to: gain = 4 or 12dB single supply 9V input impedance of 100k output impedance of 20k when i run the simulation i come across some interesting results. it does not have the correct biasing i chose ( 4.5V ) and the signal is clipping. attached is the schematic and simulation results. please help or give any advice.