Cataclysmic variables show rapid variability that characterizes the accretion process. From the results so far, we know that the characteristic frequencies of such variability depend on the stage of activity. While during the outburst of a dwarf nova V1504 Cyg the 1 mHz frequency is dominant, in the quiescence a lower frequency around 0.4 mHz is evident. The aim of the work is to obtain a smooth course of frequency change using data from the Kepler satellite and to determine whether the 1 mHz signal disappears and a still-present signal around 0.4 mHz appears, or the frequency smoothly changes from 1 mHz to 0.4 mHz. Both cases lead to different interpretations and localization of the source of the rapid variability.