ACM: Trying to set a default MPU6K filter rate of 10Hz for TradHeli. Doesn't Work.

ArduCopter/config.h

@@ -103,6 +103,7 @@
   # define HELI_YAW_FF					0  
   # define RC_FAST_SPEED 				125
   # define STABILIZE_THROTTLE			THROTTLE_MANUAL
+  # define MPU6K_FILTER                 10
 #endif
 
 
@@ -118,6 +119,9 @@
 #ifndef CONFIG_IMU_TYPE
  # define CONFIG_IMU_TYPE CONFIG_IMU_OILPAN
 #endif
+#ifndef MPU6K_FILTER
+ # define MPU6K_FILTER MPU6K_DEFAULT_FILTER
+#endif
 
 //////////////////////////////////////////////////////////////////////////////
 // ADC Enable - used to eliminate for systems which don't have ADC.