wiki well lets try...   I saw on the LPC17 shematic: That on J5A - A3   a  DAC   is aviable @ I assume 0-3.3V? for CV I need  a  level shifter to get 0-5V  (Analog) >>> I assume OP-AMP will do the job I will use some pins from the DIO-MATRIX as GATES, so i need no Logical Level-Shift -  (0V and 5V)           Most of UI  and the GATES is done by DIO-Matrix:       Features (very minimalistic)