fixed default parameters for istor in filters (were p, but should have been o), added other versions of vcf
fixed default parameters for istor in filters (were p, but should have been o), added other versions of vcf

csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound