text:  You're hearing a slow flow echoes from PRX and I'm John DiLiberto. And we will go nonstop in this half hour as we usually do in the slow flow. It's going to include Merge, Chiasmos, C37 and Eric Volo. But let's start with Byron Metcalf and Ari Urban. Byron Metcalf is a wonderful percussionist. He's worked with Steve Roach.