TheJam104 said: Another reason why your also not going to get the nirvana sound is because on alot of recordings he used other distortion pedals like a Big Muff, Tech 21 Sans Amp, and a ds-2 turbo distortion. I'm sure there were other pedals he used also.
And the countless tracks, editing, pickups, guitars and body woods, amps with certain tubes other things in the signal path plus the mic.