Your computer mic will be biased towards vocal range frequencies anyway. Components of the voice that are unpleasant are in the upper mid range around 3-4k i think. For smoother voices what you really want is specialised compression to get rid of sibilance (hissy s sound) and plosives (low frequency large air movement caused by b, d, p sounds) from listening to a lot of voice calls recently though I think most machines do quite a lot of this automatically. The key here thou is don't get too close to the mic as it exaggerates these effects.
