I was missing spillover since approx. 1254 years...
Delay is located at the delay slot, reverb at the reverb slot.
In Rig menu page 1 the checkbox for "Rig spillover Off" is off.
But I never heard a nice spillover...
Why ? Now I figured out :
I am usually incrementing rig´s volume and delay feedback/mix a little by morphing in order to get a nice solo sound (works great!)
Morphing is engaged by re-pressing the same footcontroller´s button.
Changing the rig from a unmorphed sound => spill-over
Changing the rig from a morphed sound => NO spill-over
Am I doing someting wrong ?
Is there a trick hidden in the manual (I read, but found none)
(I am always using the browser mode, for me it feels more simple)
EDIT : Actual software is OS 126.96.36.19961B,
but as mentioned above, I never heard a nice spill-over before