I can't really say much in terms of settings on the Katana, but for EQ I found that these settings work quite well for an A7X tone, and should work for Unholy Confessions;
Treble: 5
Mids: 6
Bass: 6
You might also want fairly high gain, but not too high. I personally use around 8-ish, but you likely won't have the same guitar as me