Check out this awesome review and demo our good friends over at Retro-Tone Junkie did of the Earth Sound Research Graphic Fuzz:
I will repost the demo here as it's pretty extensive and shows off how thick and chunky the fuzz can get (watch in HD for best quality sound!).
One thing I will note is that the "squeeling" sound you hear towards the end is a common challenge with these pedals. I have read that it is attributed to a bad op-amp chip, but I don't know for sure. The one I reviewed a while back does not have this problem, but I have heard of many other people who have run into this sound... so be aware if you are going to buy one///
thanks for watching!
and make sure to check out the Retro Tone Junkie Blog///