Update tokenizer-base.json

tokenizer-base.json

@@ -752,6 +752,7 @@
         "will_end_token": true,
         "dissonance_token": true,
         "amplitude_token": true,
-        "average_octave_token": true
+        "average_octave_token": true,
+        "chord_extension_token": false
     }
 }