Shakmat SumDif — Demo Published on Oct 25, 2018 Shakmat Modular
"A quick tour of the Shakmat SumDif 2hp module."
"SumDif is a dual adder/differentiator module capable of handling both CV and audio signals. If you send a 3V signal at the A input and a 1V signal at the B input, then the A+B will output 4V while A-B will output 2V. Numerous applications, like unity mixing, buffering and inverting, can be achieved; you can also experiment with Mid/Side audio processing ! The SumDif has a precision signal path and can process V/oct signals perfectly. The two jumpers on the back side allow to reduce the A+B and A-B outputs gain by 6dB.
Features
• Dual 2 inputs adder/differentiator for CV or audio (For example if the first input is 3v and the second output is 1v, sum output provides 4v and dif output 2v)
• Each section can be used as as a 2:1 unity mixer, a 1:2 buffered multiple or a signal inverter.
• Mid Side processing application
• Optional -6dB gain for the first section
• 15 mA +12V / 15 mA -12v
• Skiff friendly (29mm deep)
• 2 HP Wide"
This confused me until I figured out that everywhere they say "differentiate" they really mean "subtract." That's not the same thing! The low-pass to high-pass trick does work, but it usually results in a one-pole filter (6dB/octave) regardless of the slope of the original low-pass filter.
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