new(strumLineGroup:CharterStrumLineGroup)
beatsVisible:Bool = true
bottomLimitY:Float = 0
conductorSprY:Float = 0
draggingObj:CharterBackdrop = null
notesGroup:CharterNoteGroup
sectionsVisible:Bool = true
strumLineGroup:CharterStrumLineGroup
strumlinesAmount:Int = 0
createGrids(amount:Int = 0):Void