The fourth CD in the "Momentum" series features a slightly different line-up, led by permanent members John Wolf Brennan and Gene Coleman. Brennan added Thomas K. J. Mejer on sopranino and contrabass saxophones and Marc Unternahrer on tuba. While the approach is still the same, the sound palette is quite different. The combination of bass clarinet, contrabass saxophone and tuba give the music a brooding, mysterious, and more dramatic feel. Total duration is over 60 minutes.