thanks in advance!

okay. here's the deal. i play annotations of an autopsy,JFAC,and animosity influenced mostly, yet i cant get the same tones. (basically death metal)
im tuned pretty low - drop B.

here's what i have to work with;

My Guitar
My Amp .

I also have this pedal left over from my old amp (it didnt have an overdrive)

my question is this; can i get somewhat a close sound without having to buy a new guitar or amp? i just need something that will work for a short while - cuz im working on getting a new guitar.