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) |
| _hp | 14 |