ok sarraqum, I couldn't find the interview, but I did cut and paste this section from wiki for you, it describes the modes and other concepts he uses related to the genres of music i mentioned earlyer, thank you for your intrest in what i was saying
"Melodically, he often incorporates modes, notably the dorian, mixolydian, and locrian, as well as pentatonic scales. In addition to scales, In the tradition of bebop players, he often quotes, or "teases" his own music or the music of others in his solos, sometimes subtly and other times directly.
Trey uses barre chords extensively, including open voicings of minor seventh, minor ninth, and minor thirteenth chords in addition to the sharp ninth chords associated with blues-based guitarists such as Jimi Hendrix. He incorporates exotic chord progressions and voicings, chord substitutions, ghost notes, and rhythmic scratching."
While he has concentrated more on funk, jazz, and rock and roll styles in his electric guitar technique Anastasio is also well-versed in country music and bluegrass modes of playing and has credited Jerry Garcia as an influence in this realm.