Methods and systems for fitting a bone conduction device are provided herein. These methods and systems comprise determining a gain to be used by the bone conduction device in providing signals at a particular frequency. In determining the gain, a fitting system may provide a test sound that is modulated between a first signal provided to a speaker and a second audible signal provided to a bone conduction device. The first and second audible signal may comprise properties such that when the two signals are added together they produce a constant amplitude output. In an embodiment, each of the first and second audible signals may comprise substantially identical frequency characteristics and signal amplitudes, such as, for example, equal amplitude sinusoids centered on the particular frequency for the measurement. When each of these two audible signals are provided to a recipient of the bone conduction device, the recipient may perceive a variance in the intensity of the sounds when the intensity of the two sounds generated by the two audible signals do not give rise to the same psychophysical loudness. If the recipient perceives this variance, the gain of the bone conduction device may be adjusted to increase or decrease the loudness of the sound provided via the bone conduction device to reduce or eliminate the variance.