You may be interested in my program HARMONY, which can display and print tablature for Anglo concertinas.
It can read abc and MIDI files, so there thousands of tunes available.
HARMONY can generate the chords if the tune does not have them.
It can display the score, play the tune or make a MIDI file.
You can easily edit or transpose the tune before making the tab.
It can also show the different possibilities available for some notes by playing across the rows.
A free trial copy can be downloaded from www.greenhedges.com
This package already includes an instrument definition file for my 30 key C/G Lachenal.
