A method is described for generating electrode stimulation signals for an implanted electrode array. An acoustic audio signal is processed to generate band pass signals each representing an associated band of audio frequencies. Stimulation information is extracted from the band pass signals to generate stimulation event signals defining electrode stimulation signals. The stimulation event signals are mapped according to independent channel-specific loudness functions to produce a set of electrode stimulation signals within channel-specific minimum and maximum threshold levels. The electrode stimulation signals are developed into a set of output electrode pulses to the electrodes in the implanted electrode array.