Synthesis Technology MOTM-440 Discrete OTA Voltage-Controlled Lowpass Filter with VC Resonance

Controls

  • Freq
    controls the cutoff frequency
  • Res
    controls the resonance
  • FM1
    controls how much FM1 influences the filter cutoff frequency
  • FM2
    controls how much FM2 influences the filter cutoff frequency
  • In 1
    controls the level of input 1
  • In 2
    controls the level of input 2
  • In 3
    controls the level of input 3
  • Bass (Normal/Enhance)
    in Enhance mode, the module adds a second audio feedback path to boost bass response at higher Q levels.

Various

Synthesis Technology

You have probably heard of the SSM2040 filter chip, used in the Prophet 5 Rev. 2 synth, the Voyetra 8, and others. Although short-lived, the SSM2040 filter had a unique sound different from a Moog, ARP or other 4-pole lowpass. Why? The design used a clever discrete OTA gain cell.

The MOTM-440 offers an updated SSM2040 architecture using matched NPN/PNP pairs and features a switch that adds a second audio feedback path to boost bass response at higher Q levels. This makes the filter "growl and rumble" even more! In addition, voltage-controlled Q allows for more sweeping effects. Three audio inputs and three CV inputs make the MOTM-440 the killer lowpass filter in your system. The internal gain structure is such that over-driving the filter is now possible (unlike the Prophet 5) to get even more nasty sounds. Did we mention it self-oscillates at high Q?

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