Do any of you know how to make a high tone from a bass string of the guitar? it happends to me sometimes and I don't get how....example: master of puppets, in the part it has 0 87 087 087 0 8 7~~~ between the first verse to the pre-verse(call it main riff if you like)....

0 is on the 6th string
8 on the 5th and 7 on the 4th and all palm muted....and in the last 7 there's ~~~~ (vibration) it needs to scream there...