Ok so there is no composition involved, basically you do instrument swaps on midis. Well, in the case of the song you uploaded, the result works very well. Mind you, you've picked one of the songs I hate the most in all 4 PS games so I don't have much to say about it but, from a technical point of view: your attack and velocity control is really exceptional (I don't know if you did those or if they were already automated in the midi file you used). The instruments are fine, though I'd lower the slap-bass's volume by at least 2dB
More please
