On Tue, March 26, 2019 11:52 am, liebrecht(a)grossmann-venter.com wrote: What method will you use to connect jack ports to applications? I find qjackctl most convenient, but since you have decided that application is not for you, will you use mixbus, jack_connect, or something else? Have you checked here for something useful? http://jackaudio.org/applications/ jackrec is useful and relatively easy to use: jackrec -f filename -d seconds [ -b bitdepth ] port1 [ port2 ... ] Ebumeter can provide visual indication of source level: http://kokkinizita.linuxaudio.org/linuxaudio/ebumeter-doc/quickguide.html Jack and ALSA audio analyzer (JAAA) can provide simple test instrument style use: http://kokkinizita.linuxaudio.org/linuxaudio/jaaa-pict.html Keep in mind that if you want to use the S/PDIF input of your interface you will have to change the clock source to S/PDIF input. Your output of lsusb previously posted showed that the interface was using internal clock, not S/PDIF clock. If you enable S/PDIF as the clock source you will need to keep a digital input always running to the interface to provide the clock. -- Chris Caudle