FF1 - Battle Scene (Song Hack)

Not sure exactly what you mean, since the tsushiy version you linked has no intro at all? But I worked up a couple quick edits. One changes the 32nd/16th notes in the intro to 24th/12th notes (matching the ff6 intro that uses 24th notes), and the other basically just splices the ff6 intro in there instead. I also corrected the pitch and echo for both. link

The glitching on real hardware is worrying, though, since this song is doing nothing unusual that might cause a glitch. I'd really like to know what to avoid, if there are any still unknown pitfalls out there! But I've no access to a copier myself, so all I can do is hope.

Unless it was the known echo feedback issue, but that probably shouldn't show up unless you've got some extreme echo going on before the battle (phantom train intro).