Yeah, I was looking through the file later and saw it was called Dist4.wav or something similar, so yeah probably a guitar
I like it though, I'll probably use it in one of my modules at some point -- beats anything gm.dls has to offer
I'd of course use it in combination with dist1, which was in the file too
I remember trying to duplicate the sound before, by actually combining a saw and sine wave... it didn't work very well, but sounded kind of cool anyway