Hey hey, I have two M-Audio Delta 1010LT cards, sync'ed via S/PDIF. Two ALSA devices were created to sum the inputs and outputs respectively. On top of that JACK is running. Now, I noticed that it is a decision between two problems that I face: if they are correctly sync'ed, some system services regularly freeze. This includes the networ, the Braille display (connected via USB). If, as has happened before, the setup isn't remembered correctly and the S/PDIF sync is not made, occasionally the cards begin to have input problems. The sound suddenly degrades with an effect like bad resampling (decimation effect). I have had these cards running for a long time in this constellation, but only in the past few years these problems cropped up. I have changed the distro from Debian to Arch Linux. On Arch I have tested the system for realtime operation several times, using the realTimeConfigQuickScan script. Could this be a kernel issues? Some ALSA update? Or a question of the kernel patches that one is running? I am running the following two kernels now: 5.6.19-rt12-1-rt or 5.8.14-arch1-1 The last time I ran Debian it was on a 2.6.3x kernel, IIRC. Any suggestions, apart from don't use your cards at once, would be very much appreciated. :) Best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c But now I'm stronger than yesterday <3 (Britney Spears) _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-user

If, as has happened before, the setup isn't remembered correctly and the S/PDIF sync is not made, occasionally the cards begin to have input problems. The sound suddenly degrades with an effect like bad resampling (decimation effect).