The 1st analog board came together, in its test harness.  It's not as ambitious as some past quad copter boards, but presents challenges in signal quality.  Made every effort to star ground the analog grounds, separate the analog grounds from the digital grounds & copy the 5V filtering discovered on the single channel board.  Although it still has an extra I2S port, decided it would be better to develop something in software using Jack to record the computer than capture the TOSLINK output.