After all of the comments in the beginning, you can change the sounds of the plugin easily:
Code:
new g_sound_impressive[64] = "misc/impressive.wav";
new g_sound_perfect[64] = "misc/perfect.wav";
new g_sound_godlike[64] = "misc/mod_godlike.wav";
new g_sound_wickedsick[64] = "misc/mod_wickedsick.wav";
That's all you need to change.