A sound features extracting unit receives a sound signal of a music piece to extract sound features. In some implementations, a method includes: generating a database of audio statistics from content; generating a query from the database of audio statistics; running the query against the database of audio statistics to determine a non-identity match; if a non-identity match exists, identifying the content corresponding to the matched query as repeating content. A web of substrate material is adapted to move between the regions with at least one roller in a first region and at least one roller in a second region. The outer crank arms are internally threaded on the side of their proximal ends for the attachment of pedals. The controller controls the transfer power supply such that the transfer voltage applied to the second transfer member in the second image forming portion is not changed nor turned on and off in a period during which the toner image is transferred to the intermediate transfer member in the first image forming portion.