diff --git a/util/nbs_converter.js b/util/nbs_converter.js
index bbe95b0..74cbb0a 100644
--- a/util/nbs_converter.js
+++ b/util/nbs_converter.js
@@ -37,7 +37,7 @@ function convertNBS (buf) {
       instrument = instrumentNames[note.instrument]
     } else continue
 
-    if (note.key < 33 || note.key > 55) continue
+    if (note.key < 33 || note.key > 57) continue
 
     const layerVolume = 100
     // will add layer volume later