Maxon Ge-601 Graphic Equalizer

It affects 6 carefully selected frequencies (100Hz, 200Hz, 400Hz, 800Hz, 1.6kHz, 3.2kHz) or 5 octaves, with a 12dB cut/boost per band and it has a 12dB output level. as an example, cutting the 200, 400 and 800Hz and boosting the 100Hz, 1.6 and 3.2kHz, the GE601 will make a single coil pickup simulate a piezo pickup acoustic guitar.