Hi, there is a tip for those who want midi conversion or editing scores.
Download Musescore 2.0 (http://musescore.org/ )
There are 3 empty scores for each tunings and some scores I made
The only problem is that:
• on shaminsen the notation is: 0 - 1 - 2 - 3 - 3# - 4 - 5 - …
and on musescore: 0 - 1 - 2 - 3 - 4 - …
(Here is a conversion table: http://imgur.com/8Tk1J4b)
• the rhythm is notated in another way
Have fun 