Pat Metheny (bottom left) and his OrchestrionDuring last night’s show at the Music Center at Strathmore, images of those Animusic digital shorts that used to appear from time to time on PBS came to mind. To the unfamiliar, the segments combined rather bland synth-based orchestrations with computer generated images of mechanical devices playing the corresponding instruments. Last night, this concept came to life. On stage was a massive metal frame, bathed in warm stage…