diff --git a/scripts/selcal-fft.py b/scripts/selcal-fft.py
index 35abb62..d2f4b13 100755
--- a/scripts/selcal-fft.py
+++ b/scripts/selcal-fft.py
@@ -72,16 +72,16 @@ for i in range(num_segments):
             return np.array([centre_frequency - width, centre_frequency + width])
 
         def magnitude_in_band(band):
-            return np.sum(normalized_magnitudes[int(band[0]):int(band[1])])
+            return np.sum(
+                normalized_magnitudes[int(band[0]/frequency_resolution):int(band[1]/frequency_resolution)]
+            )
 
         scores = {
             tone:decibels(magnitude_in_band(band(frequency)))
             for tone,frequency in TONES.items()
         }
 
-        print(scores)
-
-        active_tones = find_top_two_keys(scores)
+        active_tones = find_top_two_keys(scores, 3.0)
         if active_tones:
             print(active_tones)