The composite film contains a carrier layer, a release layer dispersed with a number of particles, a hardening layer, an ink layer, and an adhesive layer, stacked in this sequential order. The products are made by an additive manufacturing process, printing thin layers of a polymer material while leaving voids of precisely predetermined shapes, sizes and distribution, with precisely predetermined thicknesses between the voids. Each of the first to third filters 18 to 20 identifies the modulation technique applied to the received signal, by the modulation identification signals A0, A1 received from a timing generator circuit 25, and filters a phase error signal PED according to the identified modulation technique. Numerous other aspects are provided. A signal detector detects the signal level of the input signal and the adjustable attenuator is adjusted in response to the signal level. At least one baffle 44 cooperates with the partitions to define a resonator chamber 34b and an associated neck 56 for establishing communication between the resonator chamber and a fluid stream G flowing past the proximate panel.