Use named constant.

Author: Archie3d

Source/aeolus/division.h

@@ -196,7 +196,7 @@ class Division
 
     List<Voice> _activeVoices;  ///< Active voices on this division.
 
-    std::bitset<128> _keysState; ///< MIDI keys state 1 = on, 0 = off.
+    std::bitset<TOTAL_NOTES> _keysState; ///< MIDI keys state 1 = on, 0 = off.
 
     /// Tells whether this division has been triggered.
     /// This is used to avoid a division to be triggered multiple