Feature request: Fingering with finger change

[Heikki Johannes Junes]

In the written music there are usually not fingering marks if the
fingering is easily guessable. If the fingering is tricky then it is shown
in the notes. In piano music there is a certain way to play a solid
legato, which is needed sometimes when the use of the pedal is
undesirable. Sometimes the finger has to changed while the key is
pressed down already. This is called silent change.

For example, fingering

   3
  1()2       (written: 1 slur 2)

means that initially middle finger (3) and thumb (1) are pressed down at
the same time. While the keys are kept down thumb (1) is changed to
forefinger (2). Silent change is here an important way of fingering, 
because it releases thumb to play an another note with a solid legato.

Current notation

   a-1 b^2 b_3

will not allow the indication of silent change.

Special fingering have to be indicated in some other way

   <e^"1-2" gis2^"3"^"(4)">

here 1-2          is another way of writing a silent change and
     (4) above 3  means that 3 is playen preffably but also 4 may be used.

Here is probably the most beautiful way of indicating silent change while
small slurs are used

             (4) 
              3
  (4)        /^\
   3        1   2   
      |          |
      |          |
  ___ |      ___ |
 /   \|     /   \| 
|     |    |     | 
 \___/|     \___/|
 /   \|     /   \|
|     |    |     | 
 \___/      \___/  

 1   2
  \_/

This was used in the book "Claudette Sorel: Compendium of Piano Technique".

Clearly, this way of fingering would need a new notation. Here are candidates:

Silent change between 1 and 2: 
 (i)    e-1()2
 (ii)   e-1~2     (maybe better, compare to e2~e4, both keep the same note)

Alternate fingering:
 (i)    e-3-(4)

Sometimes it is very hare for the player to find fingering. On the other hand
fingering have always an effect on the articulation. During the baroque 
fingers were even categorized to weak and strong fingers. For example,
thumb is strong while ring finger is weak. Hence, by giving fingering
the composer indicated also a lot of the articulation.

--
      Heikki Junes