HI, Im trying to use my tascam 3200 in conjunction with my apollo x8p. I was hoping to use the tascam for an additional 8 inputs via the adat (light pipe) cables. i've plugged in the optical cables, set my I/O, clock to external on tascam, and output to adat. im not getting any signal to the apollo when testing. Any help of info would be greatly appreciated, thank you.