The current soundtrack I am working on for the SNES MIDI Remaster Project has issues with lots of the strings.

A sustained note slowly fades out using expression, and then the next note instantly jumps to expression 127 on the same tick that the previous note has been turned off.  This causes transients from the previous note to briefly sound at full volume.  In one previous soundtrack I ended up duplicating the tracks and then alternating each original track's notes between the two new tracks.

I've tried to work around it this time by gapping the string notes, which only helps somewhat.  So I want to see if there is some sort of "smoothing" I can do in any of the commonly available Windows MIDI editors to make the expression of the new note blend with the one of the old so the transition isn't so jarring.  I have Anvil Studio, Sekaiju, and Sonar as the main ones I use, plus assorted others for converting to/from text etc.  I would only need it to apply to the strings, which sometimes share a track/channel with one or more other instrument(s).

If worse comes to worse, I can always do the duplicate/alternate hack again, but it's time consuming (and I haven't added that in to my editor yet 😆 ) but I'd rather just be able to have it sound good without all the extra modification.