No success yet.
To julien: Thank you. Version 3.6.1 installed.
To ecaroh: Thank you. Yet it seems that Logic Express does not correspond with Logic Pro. The I/O button in the left column of the inspector displays: Post-pan Post-fader, Pre-fader, No sound and Bus, but not "AU instruments > Modartt > Pianoteq" as you said it should.
Here what works with Logic Express 9:
When selecting Media, the Library opens and displays a window with two columns. When an instrument is chosen e.g. choir (left column) and then mixed choir (right column), this is automatically assigned to the selected channel strip and also to the inspector.
What NOT works:
When the “search library” is chosen, then Pianoteq shows up in this search window but not in the instruments’ list below. I assume that this is the reason why I cannot select Pianoteq as an active instrument. So the question is:
What is to do, so that Pianoteq appears in the instruments list in the same manner as the native instruments of Logic Express 9 do as in the example given above?
At the moment it would be of help if someone with the exact same configuration could give some advice.