Dear Prof. Dr. Hans Ekkehard, Thanks for your answer!!!! Sorry to insist, but regarding the part about the gating variable following its own first-order differential equation, should I include it in the NestML model itself? I guess so, but I haven't seen any example of that... Finally, what about the intrinsic current with a Lorentzian distribution... should I implement a new "current generator" (I am not sure this is the right name)??? Sounds logical, but perhaps there are other options... Thanks again!!! cheers, gus.-