When we write MIDI strings, including MIDI Supertracks and regular MIDI styles, we avoid retriggering the same note.
So from C to AM we would hold the common tones of C and E for example. So you might be better off using a MIDI strings part, either a MIDI super track or a single track from any MIDI style which you do from the track menu (eg strings track) and choose custom midi track.

Have Fun!
Peter Gannon
PG Music Inc.