 
             #endif
 
-            try self.engine.start()
+            try engine.start()
             shouldBeRunning = true
 
         } catch {

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

            #if os(iOS)


        tester = AKTester(node, samples: samples)
        output = tester
        start()
        engine.pause()
        tester?.play()
        let renderer = AKOfflineRenderer(engine: engine)
        renderer?.render(Int32(samples))
    }

