if i remember correctly, in order to import an "i1" pfield statement there has to be an "i1" class defined in stella to accept the pfield data. so if your statement were: i1 0.0 1.0 440.0 .5 there would have to be a definition of an I1 class with appropriate parameters, for example: (defobject i1 (csound-note) (dur freq amp) (:parameters ins time dur freq amp))