A method for processing sound signals for use in a hearing prosthesis, comprising: (a) converting said sound signal into an electrical signal; (b) processing said electrical signal into a plurality of frequency channel signals, each frequency channel signal having an amplitude envelope to define at least one set of first channel outputs and one set of second channel outputs, wherein the step of processing the electrical signal into a plurality of frequency channel signals includes: (b.1) passing the electrical signal through a first bank of band pass filters to obtain a plurality of spaced frequency channels; (b.2) passing the plurality of spaced frequency channels through a corresponding plurality of envelope detectors to produce a set of corresponding channel envelope signals as the set of first channel outputs, wherein each channel envelope signal of the set of first channel outputs is smoothed in time by a channel envelope tracker to derive slow moving channel envelope signals as the set of second channel outputs.; wherein the method further comprises (c) obtaining information relating to a fundamental frequency of the electrical signal; (d) obtaining information relating to a harmonic nature of the electrical signal; (e) modulating the set of first channel outputs and the set of second channel outputs in accordance with the information relating to the fundamental frequency and the harmonic nature of the electrical signal so as to generate at least one modified set of channel outputs; (f) selecting one or more channels from the at least one modified set of channel outputs to define at least one or more channels for electrical stimulation by a corresponding electrode of the hearing prosthesis, as well as the magnitude of said electrical stimulation. (a) converting said sound signal into an electrical signal; (b) processing said electrical signal into a plurality of frequency channel signals, each frequency channel signal having an amplitude envelope to define at least one set of first channel outputs and one set of second channel outputs, wherein the step of processing the electrical signal into a plurality of frequency channel signals includes: (b.1) passing the electrical signal through a first bank of band pass filters to obtain a plurality of spaced frequency channels; (b.2) passing the plurality of spaced frequency channels through a corresponding plurality of envelope detectors to produce a set of corresponding channel envelope signals as the set of first channel outputs, wherein each channel envelope signal of the set of first channel outputs is smoothed in time by a channel envelope tracker to derive slow moving channel envelope signals as the set of second channel outputs.; wherein the method further comprises (b.1) passing the electrical signal through a first bank of band pass filters to obtain a plurality of spaced frequency channels; (b.2) passing the plurality of spaced frequency channels through a corresponding plurality of envelope detectors to produce a set of corresponding channel envelope signals as the set of first channel outputs, (c) obtaining information relating to a fundamental frequency of the electrical signal; (d) obtaining information relating to a harmonic nature of the electrical signal; (e) modulating the set of first channel outputs and the set of second channel outputs in accordance with the information relating to the fundamental frequency and the harmonic nature of the electrical signal so as to generate at least one modified set of channel outputs; (f) selecting one or more channels from the at least one modified set of channel outputs to define at least one or more channels for electrical stimulation by a corresponding electrode of the hearing prosthesis, as well as the magnitude of said electrical stimulation.