Dear guys, I am writing here because I have some problem with my setup. It is composed by: -Linux based audio workstation (Fedora Core 3 with PlanetCCRMA, RME HDSP9652) -Z-sys z-8.8a lightpipe digital detangler (http://www.z-sys.com/pp_routing.html#z8) -RME ADI-8 Pro -A modified SACD/DVD-A/DVD/CD player which is capable of outputting 6 (5.1) discrete PCM channel (for SACD a DSD->PCM conversion is performed, converting DSD to 24bit/88.2Khz PCM signal) On the workstation AlmusVCU is running, which is used as a real-time convolver. The system is connected as follows: modified SACD/DVD-A/DVD/CD player-->(3 s/pdif cables)-->Z-sys z-8.8a-->(1 ADAT cable)-->RME HDSP 2496 ADAT 1 input-->(1 ADAT cable from ADAT 1 output)-->RME ADI-8 Pro ADAT input the clock signal is generated internally by RME ADI-8 Pro (48Khz), which is connected by word clock BNC cable to RME HDSP9652, which is setted in slave mode. Z-sys z-8.8s does not have an internal clock, so this is provided through its input 1 by ADI-8 Pro ADAT output; the Z-sys unit is also setted with SRC ON, so it resample all incoming signal to 24bit/48Khz (48Khz is provided by ADI-8 Pro) on output. Now the problem is the sound is very crappy, similar to what you can hear when DAC is not synched with source signal: switching SRC to OFF on Z-sys unit provides an even more crappy sound. I tried all different clock routings I can think to, but never solved the problem: does anyone can provide some general (I know it will be hard to "get into" this setup) rules for clock signal routing in setups like mine? I also tried to play music directly in the audio workstation sending it to RME ADI-8 Pro (AlmusVCU allows this) and everything sounds fine, so I think the problem is given by Z-Sys unit. Thank you very much in advance to everyone who will reply! Michele