About the Slow Motion, Sound and FPS

Hey i'm new at forum and i have some questions about Moto g (2 generation)

In slow motion mode i read they record at 60fps and playback at 15fps (i used MKVToolNix GUI to convert to 60fps, it's amazing)
1 - There's a way to make the cellphone record and save at 60fps ?
2 - There's a way to save slow motion sound?

And there's an app called L Camera
1 - The L Camera is only for Nexus, but there's a way to make work in moto g ?
2 - There is any other app and software changes that make they record in 60fps?

Thanks :) and sorry for my bad english, i'm from Brazil.