diff --git a/src/helpers.js b/src/helpers.js
index 76447e63..be9d1da9 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -29,7 +29,7 @@ define(function (require) {
    */
   p5.prototype.freqToMidi = function(f){
     var mathlog2 = Math.log(f/440) / Math.log(2);
-    var m = Math.round(12*mathlog2)+57;
+    var m = Math.round(12*mathlog2)+69;
     return m;
   };
 
@@ -200,4 +200,4 @@ define(function (require) {
     return o;
   };
 
-});
\ No newline at end of file
+});