Holger Marzen wrote: I sorted everything out, there is nothing that do not work pulseaudio/jack/bluetooth/all desktop sound and I can now route as i wish with patchage. Very nice. I can now focus on spdif. My keyboard is connected to the 1818 via a direct spdif link. I can use the easy midi connections but I prefer spdif. Always had great results with it live. I know that spdif is always routed to the channels 9&10 on 1818vsl. Somehow though mixbus sees absolutely no signal on 9&10 and I made sure that all alsa capture volume settings are maximum. All other inputs are successfully routed to mixbus and I get a signal. I am just a bit baffled about why it suddenly does not work. All spdif sync signals are handled between 1818vsl and the keyboard, so that cannot be the problem unless alsa for some reason need them, but I cannot see why. It must be the case as mixbus seemingly have timing ports. My understanding is that I do not need mtc/ltc for any spdif signal to at least appear in mixbus as a precondition, neither does 1818vsl seemingly forward the clock through usb. If it is alsa seemingly do not recognize it. all I can think of is that there is an alsa error muting channels 9&10. They are clearly connected correctly by jack. See attached graphic http://grossmann-venter.com/issues/jack/routes.png