When a digital still camera stores moving image data in an image memory card, audio data obtained by a microphone and audio data of desired music obtained from a music memory card are mixed at a desired mixing ratio, and the mixed audio data is stored in the image memory card with the moving image data. The through holes are generally parallel to the axis. Each potential cut-off frequency is associated with a respective potential difference between a sensor measurement and the stored historical sensor measurement. The applicant does not intend that this abstract be looked to in order to aid or assist in the determination of the scope of any claim.