diff --git a/rt_note_analysis.py b/rt_note_analysis.py
index 0feabac..900211a 100644
--- a/rt_note_analysis.py
+++ b/rt_note_analysis.py
@@ -30,10 +30,14 @@ class RT_Analyzer:
 
         if result:
 
-
             sigV = result.value
 
+            # convert the audio signal vector to contain only the first (left) channel
+            if len(sigV.shape)>1:
+                sigV = sigV[:,0].squeeze()
+            
             anlArgs = types.SimpleNamespace(**anlArgD)
+            
 
             rmsDbV, rms_srate, binHz = audio_harm_rms( audioDev.srate, np.squeeze(sigV), anlArgs.rmsWndMs, anlArgs.rmsHopMs, anlArgs.dbLinRef, midi_pitch, anlArgs.harmCandN, anlArgs.harmN  )