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OSD is centered around combining voltage in useful ways. Audio, V/Oct, and control voltage are at home in this utility. OSD offers a fully DC coupled signal path with precision components to make this happen. High quality, configurability, and compact size ensure OSD will always find it's way into your patch.

  • Combine v/Oct sequences with precision summing, or enable the the precision OR circuit for completely different results.

  • Mix two envelopes or an envelope and lfo using sum to create large accented voltages or combine with OR to keep the output in the original range.

  • Crossfade between audio or control voltage using the potentiometer in block one. Setting DIF will invert the signal at the B jack.

What is OR, SUM, and DIF?

OR - Input voltages are compared and the higher of the two is passed to the output. 

For example if A = 4V and B = 8V, the output will be 8V.

SUM - Input voltages are added together to create the output voltage. 

For example if A= 3V and B=4V, the output will be 7V. This clips at -10V and 10V.

DIF - Lower voltage source is subtracted from the higher voltage, producing an output of the difference between the two.

For example if A= 3V and B = 5V, the output will be 2V.

Controls / Configuration

Block 1 - Sum, OR, or Difference of two inputs and effect the mix of the A input to the B input with the Knob. The third input ORs with the result of the A/B inputs.

Block 2 - Sum, OR, or Difference two inputs with a fixed mix of 50%. The third input ORs with the result of the A/B inputs.

Block 3 - 3 input OR. Mix gates or CV from three sources for some wild results.


Size: 4hp

Depth: 40mm(with cables)

Power: 50mA +12V, 50mA -12V

All Inputs: >=100k ohm impedance .1% Resistors

All Outputs: 470 ohm impedance impedance compensated for precision.

20Vpp range

  • 4hp
  • 40 mm deep
  • 50 mA +12V
  • 50 mA -12V
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