Super slow mo

[evohicks]

Been trying to get slow mo videos but always seem to catch the beginning or end of what I want, never the actual target, anyone use this mode and can give a brief outline?

 

[Nakrohtap]

I know you can use Auto mode and you can select when the super slow motion starts. It looks like you get 5 different opportunities during a recording to use this effect.
My question is how do you change or get rid of the random music they put in your video?