Michael Bisio’s Undulations puts his double bass front and center, unfolding long-form free jazz improvisations that push arco drones into jittering pizzicato figures. On Omnitone, the album favors patient tempos, cavernous low end and microtonal inflections, situating Bisio between improvised music and avant-garde jazz. His phrasing alternates bowed sustain and percussive attack — minimalist in gestures, mercurial in timing.