Casio Keyboard WK-225 demo songs (rhythms only)

It is actually possible on the newer line of Casio keyboards to mute the melody and accompaniment tracks for the built-in demo songs using a MIDI sequencer, so that only the rhythm can be heard. This video showcases what this sounds like on the Casio WK-225 keyboard. I did this by looping a midi file that repeatedly mutes all 16 MIDI channels. For some reason, the rhythm itself cannot be muted. This should work with any modern Casio keyboard starting with the AHL sound chip. Note: some of the songs, including the two demo tunes at the beginning, and most of the songs from the piano/classics category were omitted from the recording, as they do not use the keyboard's rhythms as part of the songs' accompaniment, and therefore were silent during playback.