Last night’s Soundstreams concert at Trinity St. Paul’s riffed off the basic idea of Bach’s Musical Offering; getting musicians to create music on a theme with a high improvisory element. The line up was the Gryphon Trio (Roman Borys, cello; James Parker, piano; Annalee Patipatanakoon, violin), SlowPitchSound (aka Cheldon Paterson); turntables, Dafnis Prieto; drum kit, Scott Good; trombone, conductor and Roberto Occhipiniti; bass. Things started out with SlowPitchSound remixing prerecorded fragments of the Musical Offering with live interventions by the trio. It was interesting and fun though whether it revealed “secret messages” I really couldn’t tell. The turntables reappeared between items in the rest of the program in very short fragments that seemed too cursory to have much to say.