The E440 is based on the 5U MOTM-440 filter with additional features such as separate outputs for each filter slope and an input Drive control.
You have probably heard of the SSM2040 filter chip, used in the Prophet-5 Rev 2, Voyetra 8, and others. Although short-lived, the SSM2040 filter had a unique sound different from a Moog, ARP, or other 4-pole lowpass filters. Why? The design used a clever discrete OTA gain cell that responds beautifully as additional gain is added to the input signal.
The E440 provides three simultaneous filter slopes: 2 Pole (12dB), 3 Pole (18dB), and 4 Pole (24dB) for selective timbral shaping. Voltage control of filter resonance (rarely found on other filters) is also available.
SPECS
Height 3U (128.5mm) Width 14hp (70.8mm) Depth 32mm Power 14-pin Eurorack (23mA from +12V, 12mA from -12V) CV input range 10Vpp (-5V to +5V), DC to 10KHz (Res CV range is 0V-5V) Audio Input 50K nominal input impedance, 100mv to 14Vpp Audio Output 14Vpp (-7V to +7V), 20Hz to 18KHz frequency range Jumper Options JP1: Bass boost enhancement (OFF/ON)
PANEL CONTROLS
Resonance Sets the initial filter resonance Frequency Sets the initial filter frequency FM 1 / FM 2 Attenuator for the FM CV inputs Drive Increases the gain of the input signal
INPUTS AND OUTPUTS
1V/Oct 1 volt per octave control for the initial filter frequency FM 1 / FM 2 Filter frequency modulation inputs Res CV Resonance modulation input Audio In Signal input for the filter 2/3/4 Pole Out Audio outputs for various filter slopes (12dB/18dB/24dB)