As Field describes in the liner notes, there was a beginning to these projects of layered saxes, flutes and percussion, then the gradual incorporation of electronics, electronic effects and other instruments. By the time we get to these later works, anything goes along these lines. There are pieces just for percussion, others for various combinations of instruments and electronics. The music can be in a minimalist vein sometimes, other times jazz and rock influences are there, still other times it's music, pure and simple. with no particular stylistic-camp affiliation.
The sheer variety of what comes keeps the listener interested. There are works that dazzle in their musicality, a few have more of the incidental feel, and that's only natural, given the contexts in which the music functioned.
If it matters to you, this is not high-modernist height-scaling. It's more pomo anything-goes music. And for all that it makes for a very good listen.