MOTM-410 Triple Resonant Filter + Dual VC LFO
Synthesis Technology MOTM-410 Triple Resonant Filter + Dual VC LFO
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 handle line-level audio sources (such as synth outputs, drum machines, or the effects sends of a mixer) and modular synth levels.