updates midi in play_note to better octave

tmk_core/protocol/lufa/lufa.c

@@ -947,10 +947,10 @@ void fallthrough_callback(MidiDevice * device,
   if (cnt == 3) {
     switch (byte0 & 0xF0) {
         case MIDI_NOTEON:
-            play_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(byte1 & 0x7F)/12.0), (byte2 & 0x7F) / 8);
+            play_note(((double)261.6)*pow(2.0, -4.0)*pow(2.0,(byte1 & 0x7F)/12.0), (byte2 & 0x7F) / 8);
             break;
         case MIDI_NOTEOFF:
-            stop_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(byte1 & 0x7F)/12.0));
+            stop_note(((double)261.6)*pow(2.0, -4.0)*pow(2.0,(byte1 & 0x7F)/12.0));
             break;
     }
   }