Patent ID: 7932458

Claim:
An analog electric filter network system for real-time processing of electrical signals in an electric guitar amplifier, said filter network system including: an input port receiving an input analog signal derived in real-time from the output of an electric guitar; an output port outputting an output analog signal derived from said input analog signal; a first potentiometer, wherein said first potentiometer is adjustable by a user to set at least in part a first voltage gain magnitude value from said input port to said output port at a first frequency; a second potentiometer, wherein said second potentiometer is adjustable by a user to set at least in part a second voltage gain magnitude value from said input port to said output port at said first frequency; a first filter network including said first potentiometer; a second filter network including said second potentiometer; a rotary switch, wherein said rotary switch is adapted to select a capacitance value by selecting either a first capacitor having a first capacitance value or a second capacitor having a second capacitance value; and a foot-operated switch, wherein said foot-operated switch is adapted to select an operating filtering network for said analog electric filter network system by selecting and making operative either said first filter network or said second filter network, wherein said operating filtering network includes a capacitor having said capacitance value selected by said rotary switch, wherein said operating filtering network operates in real-time on said input analog signal to derive at least in part said output analog signal.