diff --git a/src/AnalysisPrograms/Recognizers/GenericRecognizer.cs b/src/AnalysisPrograms/Recognizers/GenericRecognizer.cs
index ab3178139..8299a8223 100644
--- a/src/AnalysisPrograms/Recognizers/GenericRecognizer.cs
+++ b/src/AnalysisPrograms/Recognizers/GenericRecognizer.cs
@@ -357,7 +357,7 @@ public override RecognizerResults Recognize(
             //    Such combinations will increase bandwidth of the event and this property can be used later to weed out unlikely events.
             var sequenceConfig = configuration.SyllableSequence;
 
-            if (sequenceConfig.CombinePossibleSyllableSequence)
+            if (sequenceConfig.NotNull() && sequenceConfig.CombinePossibleSyllableSequence)
             {
                 // Must first convert events to spectral events.
                 var spectralEvents1 = allResults.NewEvents.Cast<SpectralEvent>().ToList();
diff --git a/tests/Acoustics.Test/AnalysisPrograms/Recognizers/GenericRecognizerTests.cs b/tests/Acoustics.Test/AnalysisPrograms/Recognizers/GenericRecognizerTests.cs
index 61dc2f147..edb2420cb 100644
--- a/tests/Acoustics.Test/AnalysisPrograms/Recognizers/GenericRecognizerTests.cs
+++ b/tests/Acoustics.Test/AnalysisPrograms/Recognizers/GenericRecognizerTests.cs
@@ -135,6 +135,18 @@ public void TestOscillationAlgorithm()
                 },
             };
 
+            config.CombineOverlappingEvents = false;
+
+            // filter on bandwidth
+            config.ExpectedBandwidth = 350;
+            config.BandwidthStandardDeviation = 20;
+
+            // filter on acousstic activity in nside bands.
+            // zero indicates no filtering.
+            config.NeighbourhoodUpperHertzBuffer = 0;
+            config.NeighbourhoodLowerHertzBuffer = 0;
+            config.NeighbourhoodDecibelBuffer = 0;
+
             var results = recognizer.Recognize(recording, config, 100.Seconds(), null, this.TestOutputDirectory, null);
 
             Assert.AreEqual(1, results.NewEvents.Count);
@@ -144,6 +156,7 @@ public void TestOscillationAlgorithm()
             Assert.AreEqual(113.15, @event.EventEndSeconds, 0.5);
             Assert.AreEqual(700, @event.LowFrequencyHertz, 0.1);
             Assert.AreEqual(1050, @event.HighFrequencyHertz, 0.1);
+            Assert.AreEqual(350, @event.BandWidthHertz);
             Assert.AreEqual("LowerBandDTMF_z", @event.Profile);
             Assert.AreEqual("DTMF", @event.Name);
         }
@@ -176,6 +189,18 @@ public void TestWhistleAlgorithm()
                 },
             };
 
+            config.CombineOverlappingEvents = false;
+
+            // filter on bandwidth
+            config.ExpectedBandwidth = 90;
+            config.BandwidthStandardDeviation = 10;
+
+            // filter on acousstic activity in nside bands.
+            // zero indicates no filtering.
+            config.NeighbourhoodUpperHertzBuffer = 0;
+            config.NeighbourhoodLowerHertzBuffer = 0;
+            config.NeighbourhoodDecibelBuffer = 0;
+
             var results = recognizer.Recognize(recording, config, 100.Seconds(), null, this.TestOutputDirectory, null);
 
             Assert.AreEqual(1, results.NewEvents.Count);