To elaborate on the post above: the one-touch function should be a on/off feature so as to give the possibility to decide if and how to apply the one-touch items (tempo, effects etc...) to the chosen rhythms without the need to press the button with each rhythm.
side note on the fingering modes: the casio chord mode permits to use one-finger chords (it's been created to make it easy to play chords); is it normal that the other fingering modes, e.g. fingered 1 accept, together with the standard form, one-finger chords too? One would expect that fingered 1, that should be the standard, default mode, would accept only standard chord forms and not one-finger chords. This thing can create problems if, for example, one wants to play a Cm chord but press the C key before the other two keys keys, resulting in the keyboard playng a C chord.