Unfortunatly not or at least not that easily.
You see, the PSX Music option will replace the FF7.exe with the 1.02 version of it, with the neccesary patch for FF7Music already applied, plus the Chocobo Patch. (Don't worry, your old one is safely backed up and will return upon uninstall.) Now if you try to patch this executable with the Hi-Res patch, it will do nothing since it requires a crisp/new/virgin FF7.exe with no patches applied whatsoever.
What you
can do is getting the exe from the offical 1.02 patch (you probably already have), apply Saint's patch, then the FF7Music patch with Cetra, then the Chobobo Patch. It works, though it's hardly the simplicity I tried to implement.
The obvious question is: Why didn't I include the Hi-Res thing in the first place? Well for once - because I cannot have my installer apply any of these patches silently during setup - that would make the Multi Patch about twice as big, since it would simply have to come with more pre-patched executables. And while I really like what Saint has accomplished so far, his patch still has a couple of bugs and is very limited resolution-wise. Not everyone can sport a display capable of 1280xsomething yet. So for now, I decided not to include Hi-Res.
To wrap this up, here are a couple of things that could happen, in order to solve this little problem:
* Other patch creators could send me command-line versions of their patches in order to have them applied during setup.
* Saint could make his patch adaptive like the Chocobo Patch already is, not requiring a fresh FF7.exe anymore (to be fair: I have
no idea how hard this might be to implement) or at least have it recognize those with common patches applied as well.
* People could bug me long and persistently, that they don't give a damn about the Multi Patch's size, as long as it does more things.