no sound in note performer

hello, all of a sudden I do not have any sound on my project with note performer … if I open another project I have sound with note performer but nothing in the first, while I see the Meter views move in the NP mixer.
I could do a wrong manipulation but? any idea?

Have you checked the Dorico mixer page, are there the meterings going? Have you maybe muted the output channel?

yes that was it … I feel a bit stupid !