Hello Robert,  the MIDster punch software runs in DOS.  You can add
new MIDI files to be punched by copying them into the same directory
as the punch software is stored.  I don't know which version of the
software you are using but in my case I have three different punch
options: 20-, 26- and 31-note.  I use the 26-note as that is the
EDITIN.EXE I programmed for 88-note format.

Paul Bell