Your Casio upon start of the style, buttons 1 and 2 are (both) assigned to an intro. intro 1 is a longer version, and intro 2 is a shorter version.
While the style is playing the same goes for the ending. Pressing either 1 or 2 will fuction just the same. One giving you a longer ending, and the other giving you a shorter ending.
If in the middle of playing a style and you press either 1 or 2 and you get an (intro) while the style is playing then something is wrong.
GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.