Violinist Gil Shaham and pianist Akira Eguchi began their odyssey through all 10 of Beethoven’s violin sonatas on Thursday evening pleasantly enough, with sprightly renderings of the first, second and third. At times, it seemed as if Shaham’s violin and Eguchi’s piano had melded into a single instrument, their intent so beautifully in sync. In the second movement, Andante, they found perfect bowings and piano textures in each variation to accentuate the differences. The second recital, on Saturday, reinforced the idea of each sonata being its own realm, while also forging connections. In the second half, Denève’s Mahler Symphony No.1 emerged long on energy and broad strokes, if short on details of execution and balance.