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