System and methods for fitting an auditory prosthesis include testing a subset of sound channels for the audio prosthesis. Adjustment values are determined for the tested sound channels, which can be electrodes in a cochlear implant. The adjustment values are efficiently determined by using a mapping function. The determined adjustment values on selected channels are then input into an interpolation function or algorithm to determine adjustment values for non-tested sound channels. The use of interpolation provides for a more efficient fitting process.
