My goal is to be able to add or delete measures in a song I have created. I use the keyboard for backing tracks. After building a song, sometimes I have to tweak a few things.

Is there a DAW or MIDI editor that will let me edit the MIDI file on a USB without destroying the file so I can put that edited MIDI files back on my keyboard and have it play correctly. Cakewalk and Anvil have both destroyed the files. They somewhat work, but the timing ends up being off, or the the file is just not playable at all.