There is no soundtrack for Slash. Slash just has a new intro and "Keep The Flag Flying" for Holy Order Sol VS Ky. The rest of the album is the same as Midnight Carnival. As for the 2 themes, they're already here and posted.
EDIT: I was thinking of Accent Core, sorry. The two tracks from Slash are not "Launch Out" & "Keep The Flag Flying". Those are from Accent Core. What you're looking for are "Keep In Gates" and "Get Down To Business" which can be found here:
http://gh.ffshrine.org/soundtracks/4178