doc/notes.txt : Update.

doc/notes.txt

 * Make a source separation based fade using an filter/inverse filter based on the
   spectrum prior to the cross-fade.  As an extra feature notice the state of the pedal
   and decay appropriately.
-* The 'cost' value is not correct - it is being displayed as the same as the related attribute.
-
+* The electronic score needs the ability to specify that the output is sent to the audible
+cross-fade channel rather than the inactive channel.
+* Add a score mode that performs some action (e.g. incr/decr) on each incoming score follower
+event.  
 
 
 * Setting the upper slope to a negative value is effective.