Hi Norbert

> I'll probably go for the envelope-solution anyway cause it's easier to
> do it live.

Yes. You don't have to do the CV2 amount that exact, as noone will
recognize the VCO tune of the first nanosecond ;-)

On the otherhand: depending on your keyboard or MIDI-interface you might
use a autoportamento, which is active only when you are playing legato,
and is disable if you play portato.