A method for providing virtualized audio information, the method comprising: receiving audio program information comprising at least N discrete audio signals; generating, using a first virtualization processor circuit (711, 811), intermediate virtualized audio information using at least a portion of the received audio program information, the generating including: applying a first virtualization filter to M of the N audio signals to provide a first virtualization filter output, the first virtualization filter comprising a Head-Related Transfer Function, HRTF, filter; and providing the intermediate virtualized audio information using the first virtualization filter output, wherein the intermediate virtualized audio information comprises J discrete audio signals, wherein J is less than N; wherein M is less than N, and wherein the providing the intermediate virtualized audio information using the first virtualization filter output includes combining the first virtualization filter output with one or more of the N audio signals that are other than the M audio signals to provide one or more combined audio signals; and transmitting the intermediate virtualized audio information to a second virtualization processor circuit (721, 822), wherein the second virtualization processor circuit (721, 822) is configured to generate further virtualized audio information by applying a different second virtualization filter to one or more of the combined audio signals, the second virtualization filter comprising an HRTF filter; wherein the second virtualization processor circuit (721, 822) includes a decorrelator circuit which is configured to apply decorrelation processing to at least one of the combined audio signals prior to applying the second virtualization filter; wherein N, M, and J are integers. receiving audio program information comprising at least N discrete audio signals; generating, using a first virtualization processor circuit (711, 811), intermediate virtualized audio information using at least a portion of the received audio program information, the generating including: applying a first virtualization filter to M of the N audio signals to provide a first virtualization filter output, the first virtualization filter comprising a Head-Related Transfer Function, HRTF, filter; and providing the intermediate virtualized audio information using the first virtualization filter output, wherein the intermediate virtualized audio information comprises J discrete audio signals, wherein J is less than N; wherein M is less than N, and wherein the providing the intermediate virtualized audio information using the first virtualization filter output includes combining the first virtualization filter output with one or more of the N audio signals that are other than the M audio signals to provide one or more combined audio signals; and applying a first virtualization filter to M of the N audio signals to provide a first virtualization filter output, the first virtualization filter comprising a Head-Related Transfer Function, HRTF, filter; and providing the intermediate virtualized audio information using the first virtualization filter output, wherein the intermediate virtualized audio information comprises J discrete audio signals, wherein J is less than N; wherein M is less than N, and wherein the providing the intermediate virtualized audio information using the first virtualization filter output includes combining the first virtualization filter output with one or more of the N audio signals that are other than the M audio signals to provide one or more combined audio signals; and transmitting the intermediate virtualized audio information to a second virtualization processor circuit (721, 822), wherein the second virtualization processor circuit (721, 822) is configured to generate further virtualized audio information by applying a different second virtualization filter to one or more of the combined audio signals, the second virtualization filter comprising an HRTF filter; wherein the second virtualization processor circuit (721, 822) includes a decorrelator circuit which is configured to apply decorrelation processing to at least one of the combined audio signals prior to applying the second virtualization filter; wherein N, M, and J are integers.