# Changing Gender and Head Size

Six speaker-definition options control the size and shape of the head. Click on an option listed below for a description of its characteristics:

Description | Option Code
Sex 1 (male) or 0 (female) | sx
Head size, in % | hs
Higher formants |
Fourth formant resonance frequency, in Hz | f4
Fifth formant resonance frequency, in Hz | f5
Fourth formant bandwidth, in Hz | b4
Fifth formant bandwidth, in Hz | b5

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