MOTM-820 VC Lag Processor

Synthesis Technology MOTM-820 VC Lag Processor


Synthesis Technology MOTM-820 VC Lag Processor

The MOTM-820 is used to add slew to an input. The most common use would be to add portamento to a control voltage feeding a VCO. In analog keyboards with portamento (Moog called this glide) the rise and fall times were the same. This is because a simple RC filter is controlled by a single pot. The shape is the same: an exponential rise and fall. Although we are used to hearing this shape, the fact that we have an exponential voltage feeding an exponential response (1V/Oct of the VCO) means that musically we are limited.

The MOTM-820 is your solution! It is the most advanced lag processor ever designed. How can we claim this? Well, just check out the features:

  • Independent voltage control of both rise (UP) and fall (DOWN) times
  • Times variable from 500us to 5 minutes
  • Ganged UP/DOWN control to emulate standard portamento effects
  • A new SHAPE control that varies the glide slopes from Linear to Log
  • Remote or panel BYPASS to turn the effect off without any DC shift!

Easy to build, the MOTM-820 also offers a "hidden multiple": it can drive 3 VCOs (or other modules) from a single input! The output stage is a special "capacitive cable driver" for driving long cables (up to 20 feet) without any voltage drop

Synthesis Technology User Guide



On Demand Info

These kits and assembled modules are offered on demand, click the link to learn more.


Module Parameters
Panel Size2U

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full kit
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synthCube assembled, new
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Tags: synthesis technology, motm, lag processor, diy, kits, analog, module