Hi @andrejkobal, welcome to the forum!
Output parameters in Max Gen is an outstanding problem, one we haven't decided yet know quite how to solve. Gen simply doesn't have the concept of output parameters.
What we've been discussing doing, and this will probably be the way forward, is to assign any 'extra' audio outputs to unassigned parameters. So that if you create a Gen patch with say 5 input parameters, and 4 audio outputs, then the first two outputs will be routed to audio as usual, and the remaining ones will be assigned to unused parameters e.g.
This way there's still no sensible way to name the parameters in Gen, so the patches can easily get confusing. To help put sensible labels on both input and output parameters we are planning to update the build system, so that parameter names that are assigned in the online patch editor will be set when you load it in the Magus.