​​​​​​​SumDif from Shakmat Modular is a dual adder and differentiator module that handles both CV and audio signals. For example, if you send a 3V signal to the A input and a 1V signal to the B input, the A+B output will deliver 4V while A-B will output 2V. The module supports numerous applications such as unity mixing, buffering, and inverting, and also allows experimentation with midband and sideband audio processing. SumDif features a precise signal path and can process V/Oct signals with great accuracy. Two jumpers on the rear panel let you reduce the gain of the A+B and A-B outputs by 6 dB.