 
         let track = AKSequencerTrack(targetNode: synth)
 
-        output = AKMixer(synth, track)
+        output = AKMixer(track, synth)
 
         var seq = AKSequence()
         seq.add(noteNumber: 60, position: 0, duration: 0.1)

        track.sequence = seq
        track.playFromStart()
        // auditionTest()
        AKTestMD5("9bea8068185763c2b1a9970a916688fa")
    }

    func testRemoveNote() throws {

        track.sequence = seq
        track.playFromStart()
        // auditionTest()
        AKTestMD5("648d39f6c4cb49d91d32245574319342")
    }

    func testTempo() {
