To get the trash tone:

Bass - 9
Middle - 3
Treble - 9

Try to play the excersices without guitar pro.

Exc 1: Alternate picking, you can pick sixteenths notes 
with all downstrokes if the tempo is slow, however, at 
faster tempos you will need tu use alternate picking.
Down picking= >
Up picking= <
Exc 2: Gallup. When you take four sixteenths and tie 
the first two together you have an eight note followed 
by two sixteenths. Skip the upstroke that falls on the 
second sixteenth, but don't change the picking for the 
rest of the notes.
Exc 3: Reverse gallup. Put the tie between the last 
two sixteenths of each beat.
Exc 4: This uses both the gallup and reverse gallup as 
well as straight sixteenth note figures.
Exc 5: Syncopation and Offbets. In this excersice the 
dotted eight note is introduced.
Exc 6: Triplets. A triplet is three notes evenly spaced 
where normally two notes would be. Just like 
sixteenths, triple may be played with all downstrokes 
when the beat is slow, but at faster tempos you'll need 
to use alternate picking.
Exc 7: Quarter notes triplets are three notes evenly 
espaced in two beats.
WORM JUICE AND BAT'S HEADS: this is the second 
song and it uses vibratos.