Saxophonist James Mainwaring's latest project sees him turning away from the lingering influence of noughties UK post-jazz that he's pursued with Roller Trio and towards something much less constrained. Here, his devilish compositions explore the modern jazz writer's ubiquitous preoccupation with balancing form and freedom. ‘Equanimity’, for instance, begins with vaporous Fender Rhodes and tinkling percussion held together by the lightest of filaments until a nagging sax riff emerges, gradually drawing the piece into ever tighter formation, like the loops being pulled on a bow, and ending in precise unison. Between the constructions, there's plenty of turbulent electric improv, with all four locking into rapidly evolving episodes of loose and supple coherence, while, on the group improvisation ‘Robin Stood as Robin Hood Should’, a modest keyboard gesture evolves through patient repetition into a sweetly melancholy moment of collective beauty. Matthew Bourne (who tutored the other three at Leeds College of Music) drops moments of throwaway genius throughout, lifting this into a session that won't win Mainwaring another Mercury Prize nomination, but is much more likely to please the serious set.