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@mitu Ok I have posted a issue.
https://github.com/jehervy/node-virtual-gamepads/issues/103
My bad ...
I had to activate multitap in retroarch. It's explained here : https://github.com/RetroPie/RetroPie-Setup/wiki/Playstation-1#multitap-3-8-player
Works great now !
Thank you!! It's working now!