I can tell you this much already...you're not having problem with a soundfont. FF7music has nothing to even do with soundfonts. It was made so people without soundfont capabilities could use mp3's or psf's to have music when they are unable to use the soundfont. Tell me this...
What input/output plugins are you using?
What are your system specifications? (cpu speed, ram, anything else you feel is relevant)
Did you read the file "effort notice.txt"? It includes all the directions...it's practically flawless.
What files are you playing that you say are stuttering?
Also, there is no way for the music to repeat when you check the "loop custom files" box. As it says in "effort notice.txt" included in the package. And I quote..
Hell, the looping function doesn't even work anyways. Have it checked just for kicks.
You must set the psf plugin to play the songs forever...which I also included in the effort notice. That is...if you are even using the psf's. And yes, I'm the guy who put the package together, along with Aaron's help. And of course cheers to Ficedula, the writer of ff7music.
Now, I don't blame you at all if you didn't read "effort notice.txt", because it really doesn't seem like it's readme material. I bet that you used readme.txt that came with. That was the readme that came with ff7music, and it's insufficient for this specific package. I'm gonna have that fixed to reduce future confusions.