Erstwhile Minnesotan Jake Armerding finds himself back in his hometown of Boston after a decade-long stint in the Midwest.  What better way to land than to cross swords with a guy he met at the Cantab Lounge in 2001 — the only man to conquer the banjo and earn an MIT doctorate in molecular biology, Greg Liszt?  The duo will feature a few songs from Jake’s back catalog and an array of fiddle tunes played in arguably their most natural habitat:  fiddle and banjo.