Ok, second time today, I have to reply to myself.

> thinking about the A-111-2 it came to my mind, whether it would better
> to split the functionality of the VCO and the morphing mixer.

I received the info that the A-111-2 is designed around a special
integrated circuit which provides both functionalities in one chip, the
most parts of the VCO and all of the morpher. So it is senseless to
discuss, whether to split this into two modules.

Florian