For what it's worth, I solved the problem myself: after rooting the phone, you should purchase "root explorer" in order to access the FFTSAVE.BIN file.
Of course, after tinkering with the very limited capabilities of the LiOS editor, I decided FFT hacking is better left to either the PSP or PSX versions! lol
Of course, after tinkering with the very limited capabilities of the LiOS editor, I decided FFT hacking is better left to either the PSP or PSX versions! lol