A 4-band EQ + High and Low Pass filter 500 series module based on the circuit found in the classic British 51 series recording console.

• High Pass Filter is 24dB/octave slope from 31.5 Hz - 315 Hz

• Low Pass Filter is 12 dB/octave slope from 4 kHz - 12.5 kHz

• Low Band - Push switch for Bell shape with a Q factor of 0.72 or a Shelf from 31.5 Hz - 315 Hz, +/- 17 dB.

• Mid 1 Band - Bell shape with Q factor of 2 from 200 Hz - 2 kHz, +/- 17 dB.

• Mid 2 Band - Bell shape with Q factor of 2 from 800 Hz - 8 kHz, +/- 17 dB.

• High Band - Push switch for Bell shape with a Q factor of 0.72 or a Shelf from 1.6 kHz - 16 kHz, +/- 17 dB.