(-) input (pin 2) grounded. (I left the internal 50k resistor from the inverting input to ground to reflect the inner circuit)
The lower switch represents shorting pins 1 & 8.
The higher switch adds the "bass boost" (treble cut) from the datasheet.
9V PSU.
200mV p-p Voltage source represents guitar signal input., 8 ohm resistor on the output is the speaker.
