More Merging Two Notes & Triplets

[Will Oram]

Hi -- sorry to bother y'all again.

While looking through the manual for something else, I came upon the 
tweak
\property Staff.NoteCollision \override #'merge-differently-dotted = ##t
to accomplish this concept:

  _____
 |     |
*  *  *
|__|__|
   3

You can see an example of what I'm aiming for in 
http://www.foxchange.com/~spamguy/misc_pictures/stavesample.jpg -- 
check the last beat of the last bar.

I tried this tweak and it didn't do anything. Perhaps I didn't place it 
in the right spot?

---

On another note (groan):

I'm trying to remove 3s from under triplets midway through a score, 
once you get the idea that they're triplets. I hear \property 
Voice.tupletInvisible = ##t and \property Voice.TupletBracket \override 
#'tuplet-number-visibility = ##f are supposed to do the job, but when I 
place this inside a block of music, only half the target tuplets have 
their numbers removed.

This can be observed again in 
http://www.foxchange.com/~spamguy/misc_pictures/stavesample.jpg -- in 
the bass line, the first three tuplets are fine, and then the 3s 
return. The treble line is similar.

Suggestions? Thanks.