*ignors signal and sards on*

j/k
Most of the old solo's are just wankery chaotic stuff, very atonal indeed.
But since C and D he started to use more minor-harmonic and minor-melodic scale parts, also the beginning of the tapping thing in the Slime solo is basically based on a pentatonic blues scale in Eb, if I'm correct. Not that it matters because then he taps half notes in that scale as well, making it minor(harmonic) again... and then the chords that are under it are totally not in a blues scale whatsoever, haha.
So yeah... in Gateways there's a lot of cool melodic stuff that definately have minor scale characteristics, etc. but I don't think any of it has been written down (if written down at all) as a solo based on a scale.
Also, on Heretic (especially in Beneath the Hollow), there are minor scale things. But that's because many of it goes along with the melody of the riffs, which is minor as well.
Basically, I think Trey just feels it all out. Listens to what the rhythm is doing, and feels his solo's out on what's going on with all the instruments. I guess that's his way of creating solo's, making it very personal, unique and lava-like.
