diff --git a/src/PolyProbe.cpp b/src/PolyProbe.cpp
index 3d71da1..9cf2219 100644
--- a/src/PolyProbe.cpp
+++ b/src/PolyProbe.cpp
@@ -110,7 +110,7 @@ struct NoteOperator : Operator {
 			}
 		}
 
-		outV = octV + semitone * music::SEMITONE;
+		outV = (octave - 4) + semitone * music::SEMITONE;
 
 		valid = true;