[linux-audio-user] Problem with multiple card installed

Hi guys, I'm running a system based on PlanetCCRMA FC1 2.4.26 kernel, with 2 Terratec EWS88D and 1 Terratec EWS88MT installed. This system is connected to a source which is capable of sending audio data on 3 stereo s/pdif coaxial cables, wich are plugged into s/pdif coax inputs of my 3 cards. The three s/pdif cables should be synched: in fact the s/pdif transmitter is only one for all 3 s/pdif outs on the source. Now I use this system for real time convolution running BruteFir: everything runs fine while I use only one card, but when I run convolution on more than 1 card I got some "clicks" on output. These "clicks" are often releated to not clock synched cards, but they should be synched: they are setted to get sync signal on s/pdif input. EWS cards allow to set a master card and up to 3 slave cards, where slave cards get sync signal from the master card: unluckily this is not possible under Linux, but only under windows. So I was wondering if someone could give a hint to try to solve the problem before I keep the solder in my hand and try to follow this guide: http://www.djcj.org/LAU/quicktoots/toots/el-cheapo/ Thanks! Michele