Synthesis Technology MOTM-410 Triple Resonant Filter with Dual VCLFO

Controls

  • Mix (Dry-Wet)
    mixes the input signal with the (filtered) output signal
  • Freq 1
    controls the center cutoff frequency of band-pass filter 1
  • Freq 2
    controls the center cutoff frequency of band-pass filter 2
  • Freq 3
    controls the center cutoff frequency of band-pass filter 3
  • Rate
    controls the speed of the LFO sweeps
  • Depth
    controls the depth of the LFO sweeps
  • Sweep
    ...
  • Single/Dual/Dual Rev
    • Single: All 3 filters are swept together by LFO #1.
    • Dual: Filter #1 sweeps with LFO #1. Filters #2 & #3 sweep with LFO #2.
    • Dual Reverse: Filter #1 sweeps UP with LFO #1, Filter #2 sweeps UP with LFO #2 while filter #3 sweeps DOWN.

Various

Synthesis Technology

The MOTM-410 contains three voltage-controlled bandpass filters, and a dual voltage-controlled sinewave LFO. The module is based on the Korg PS-3100 filter structure. It uses the same "vintage" components: Vactrol resistive elements for a smoother, 'liquid' phasing sound, and JRC4558 bipolar op amps. However, the control section has been updated to include:

  • Voltage-controlled LFO Rate (0.02Hz to 100Hz)
  • Voltage-controlled LFO Depth (0-100%)
  • Individual filter outputs
  • Master SWEEP control voltage

The MOTM-410 can be used as a "fixed" filter bank: just set the DEPTH to zero. Because narrow filters are used, vocal formants can be created using the independent center frequency controls.

The on-board LFO structure contains 2 "detuned" voltage-controlled LFOs (one LFO is running 20% slower than the other one). The LFOs have true sinewave outputs for best sweeping effects. You can use the panel controls, or plug in up to 3 seperate control voltages (SWEEP, RATE and DEPTH)!

Another unique LFO feature is the MODE switch. It controls how the 3 filters are swept as:

  • Single - All 3 filters are swept together by LFO #1.
  • Dual - Filter #1 sweeps with LFO #1. Filters #2 & #3 sweep with LFO #2.
  • Dual Reverse - Filter #1 sweeps UP with LFO #1, Filter #2 sweeps UP with LFO #2 while filter #3 sweeps DOWN.

The MOTM-410 has 3 separate audio outputs, which can be used to create frequency-dependent stereo panning. Using 3 inputs on your mixer, you manually pan Filter #1 LEFT, #2 to CENTER, and #3 to RIGHT. The LFOs then sweep the stereo field, based on the frequency content of what you are playing. Or, turn off the LFOs and use the fixed filter to "direct" the sound to a specific mixer channel, again based on input frequency.

The MOTM-410 can be used with any line-level audio source (synth outputs, mixer effect sends, etc) or integrated in a modular system.

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