I have a lot of hardware, including several Tentacle Sync units that send LTC audio to cameras. I need to connect this audio to Linux for some MTC coding in C/C++ of midi events for "live in the studio" performances. I am a little rusty in my Linux Audio skills. I seem to have this interface ready to go with Jack but I get no sound of the LTC from my internal speakers with or without Jack. I am running OpenSuse leap 15. I have two shells open, one with a Jack Session and one with jltcdump. The jack command does change the display on the interface. I couldn't get qjackctl to recognize the usb interface, only the default intel sound devices. Audacity doesn't see the device. Any ideas? Shell 1: [linux-fesf(root)] /root> cat /proc/asound/cards 0 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xed128000 irq 141 1 [USBPre2 ]: USB-Audio - USBPre2 Sound Devices USBPre2 at usb-0000:00:14.0-1, high speed [linux-fesf(root)] /root> jackd -d alsa -d hw:USBPre2 jackdmp 1.9.12 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2016 Grame. Copyright 2016-2017 Filipe Coelho. jackdmp comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details no message buffer overruns no message buffer overruns no message buffer overruns JACK server starting in realtime mode with priority 10 self-connect-mode is "Don't restrict self connect requests" audio_reservation_init Acquire audio card Audio1 creating alsa driver ... hw:USBPre2|hw:USBPre2|1024|2|48000|0|0|nomon|swmeter|-|32bit configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods ALSA: final selected sample format for capture: 24bit little-endian in 3bytes format ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 24bit little-endian in 3bytes format ALSA: use 2 periods for playback Shell #2, does nothing. [linux-fesf(robert)] /home/robert> sudo /usr/local/bin/jltcdump ## SMPTE | audio-sample-num REV| unix-system-time ##u-bits time-code | start end ERS| start end #Start: sample: 0 tme: 0.000000000