A system, method, and computer program product for calibrating a stimulation device such as an implantable pulse generator (IPG). An IPG, whether it is a self-contained implantable pulse generator (SCIPG) or externally-powered implantable pulse generator (EPIPG), communicates with an external programmer to determine the characteristics of the stimuli delivered to the lead electrodes. An external programmer is used with patient feedback to determine initial threshold levels, and using the initial threshold levels, to determine threshold levels for combined electrode arrays.