Hi Mark, >Yes, I tried this yesterday. It doesn't compile because my machine is >AMD64... you have to edit the Makefile and change the 9th line from: CFLAGS = -O2 -march=pentium4 -fno-fast-math to CFLAGS = -O2 -march=athlon64 -fno-fast-math then it should work fine. >One other idea. Remove the two ADAT cables going to your ADI-8 Pro and >then loop on back on itself so that the ADAT output goes back to the >ADAT input. This will return whatever signal you send and allow to you >determine if the problem is in the HDSP 9652 or in the ADI-8 Pro. this is a good idea! I will try! Michele