Expression Map Groups

Hi,
I have a Question to the Groups in Expression Maps. How do they work ?
In Electric Bass I want the Bass play `Sustain’ but also a special Note should play on B String. So I created a Soundslot with a Attribute to play B-String (Note C-1) and set it to Group 2. The Infoline tells me the Attribute is set, but the note is not plaid on the B String. The Attribute of Group 2 had no effect.
What dit I wrong ?

Keybert

This is how it works: you need to create Sound Slots for every possible combination.

So in your case:

Slot 1: Sustain (default) (Art. 1)
Slot 2: Sustain (in Art. 1 column) + B-String note (in Art. 2 column)