Thank you Andi for your answer.
The problem is the following: I use a global model from another bank (I will explain why below in P.S.). When I go to choose manually an Expression map for my singers, there is only "SYzd Voices - So, Al, Te" and "SYzd Voices - bass". In the global template option, there is the "SYzd Voices" template and everything is fine, but not in individual Expression map.
P.S. Why do I have to use another bank ? Because, despite my purchase of "SYzd solo string", the Expressions maps are not complete (while they are complete for the other bank, or at least more advanced - without the repeat patches though). This is very disappointing. Not even a programmed harmonics patch, according to my tests, which is not a very rare articulation! I prefer my VSL products, but I'm not sure I want to get into programming Expressions maps.
If I can get help with this, here is my nomenclature:
Mezzo-soprano (VSL SYzd)
Baritone (VSL SYzd )
Bass (VSL SYzd )
Clarinet siB (Other - I have the full VSL clarinet but VI, so no Expressions maps)
Bass clarinet (Other - this instrument is not offered individually in VI, and anyway no Expressions maps). Note: I have the SYzd SE Vol. 1, 2 and 4, but I would have to buy also the Vol 1 + at 265 Euro, which is getting expensive, especially if the Expressions maps are not complete).
Piano (VSL SYzd)
Percussions (VSL SYzd SE)
String quartet (Other)