SumDif from Shakmat Modular is a dual adder/differentiator module that can handle both CV and audio signals. If you send a 3V signal to the A input and a 1V signal to the B input, the A+B will output 4V while A-B will output 2V. Numerous applications, such as eg. UnityMix, buffering and inverting, can be implemented; you can also experiment with midband/sideband audio processing! The SumDif has a precise signal path and can process V/Oct signals perfectly. The two Jumper on the rear panel allow to reduce the gain of the outputs A+B and A-B and 6dB.