swift - Mute Music and Mute Sound Buttons -

i putting finishing touches on arcade-style game making using swift , spritekit in xcode.

my game has 2 scenes:

1. a main menu scene play button located
2. a game play scene.

i want able put node acts button mute background music across both scenes , node acts button mute sound effects across both scenes.

i want both of these buttons located on main menu scene. have idea how program button mute music/sound-effects have no idea how connect button across both scenes.

i stay muted (or un-muted) after user closes app , re-opens it. please need this, , please specific , straightforward on should because new coding. overall, want know how program node acts button able work across , access properties 2 different scenes.

p.s. using avfoundation run music , sound effects

i make avfoundation audio player global ever set up

  import avfoundation     var player:avaudioplayer = avaudioplayer()      class viewcontroller: uiviewcontroller { 

then on each viewcontroller ctrl drag , drop button in action

 @ibaction func mute(sender: anyobject) {      player.volume = 0  }