The 2CVADD-HQ is a dual precision adder especially for adding 1V/octave (pitch-controlling) CVs. This makes it possible e.g. to transpose a sequence. Compared to general purpose CV mixers (like POLAMIX), this module does the summing of the CVs very precise (within a few millivolts), so the desired pitch is not affected.
The module offers three CV inputs for each of the both units; the first unit has an additional fourth input where the CV is subtracted - meaning "transposition downwards".
If you would like to have transposition buttons to shift by one or two octaves (or a free offset), take a look at the CVADDER-HQ module.
More information can be found on the AE Modular Wiki.
(Price without VAT; for buyers inside the EU 19% VAT will be added to the shown price = 45,22€)