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WMD's OSD, also known as OR SUM DIF, is a multi-function voltage utility, perfect for combining voltages to generate new signals related to the inputs. The three functions the module operates in are OR, SUM, and DIF. With OR, the module compares the incoming voltages and outputs the highest one. If the input signals are 3V and 7V, the output will be 7V. SUM adds the input voltages to get a combination of the two. If the input signals are 2V and 4V, the SUM output will be 6V. The SUM clips at +/-10V. DIF subtracts the lower voltage from the higher voltage, producing the difference between the two. If A is 2V and B is 6V, the output signal will be 4V.

It features three channels, each with slightly different behavior. Block one allows you to choose between the three functions and crossfade between the A and B inputs with the knob. A third input ORs the result of the A/B inputs. With block two, the two inputs feature a fixed mix of 50%, and it also includes a selection between the three functions with a third OR input. Block three simply features a three-input OR circuit.

OSD works excellently with a wide range of input signals from audio to precise 1V/oct sequencing to any of your modulation sources. The high-precision parts ensure no signal degradation and accurate combinations of your inputs.

OSD Features

  • Multi-function utility
  • Works with audio, 1V/oct, or modulation sources
  • OR outputs the highest voltage
  • SUM adds two voltages together
  • DIF subtracts one voltage from another to get the difference
  • Channels one and two features switches to select modes
  • Channel one features a crossfader
  • Channels one and two feature a third OR input
  • Channel three features a three-input OR circuit
  • LED indication of signal strength
  • Eurorack module
  • Width: 4hp
  • Depth: 40mm
  • Current draw: 50mA @ +12V, 50mA @ -12V
WMD OSD CV Utility Reviews