     /// Stop the audio engine
     open static func stop() {
         // Stop the engine.
-        self.engine.stop()
+        engine.stop()
         shouldBeRunning = false
         #if os(iOS)
         do {


            #endif

            try self.engine.start()
            shouldBeRunning = true

        } catch {

        }
        // Start the engine.
        do {
            engine.prepare()

            #if os(iOS)

