[Jackaudio] Using jack with a Boss RC-505

Hi, I have been using jack for years without problems on my debian/stable PC running 4.19.0-17-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.194-3 (2021-07-18) x86_64. I recently acquired a Boss RC-505 which is giving me trouble getting it's USB audio working. (By contrast I have a Scarlett 2i2 external USB sound card which works 100%) I use qjackctl to set jack up, and it is giving some error messages which I will include below. From the perspective of dmesg, lsusb and the info in qjackctl, it looks like the RC-505 is being detected correctly it seems. FYI when I set up qjackctl to use the RC-505 instead of the Scarlett, I see that jack is set up as follows:     /usr/bin/jackd -dalsa -r48000 -p256 -n2 -Xseq -D -Chw:RC505 -Phw:PCH I am a programmer, so I'm not afraid to "get my hands dirty" - I just don't know where to start. What would you guys suggest? Here's the output from qjackctl: 8<----------------------------------------------------------------------------------------------------- 15:30:24.643 Statistics reset. 15:30:24.645 ALSA connection change. 15:30:24.653 JACK is starting... 15:30:24.653 /usr/bin/jackd -dalsa -r48000 -p256 -n2 -Xseq -D -Chw:RC505 -Phw:PCH Cannot connect to server socket err = Connection refused Cannot connect to server request channel jack server is not running or cannot be started JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock Cannot connect to server socket err = Connection refused Cannot connect to server request channel jack server is not running or cannot be started JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock 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 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 Audio3 Acquire audio card Audio1 creating alsa driver ... hw:PCH|hw:RC505|256|2|48000|0|0|nomon|swmeter|-|32bit 15:30:24.817 ALSA connection graph change. 15:30:24.818 JACK was started with PID=30608. configuring for 48000Hz, period = 256 frames (5.3 ms), buffer = 2 periods ALSA: final selected sample format for capture: 32bit integer little-endian ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 32bit integer little-endian ALSA: use 2 periods for playback 15:30:24.953 ALSA connection graph change. port created: Midi-Through:midi/playback_1 port created: Midi-Through:midi/capture_1 port created: RC-505:midi/playback_1 port created: RC-505:midi/capture_1 port created: RC-505:midi/playback_2 port created: RC-505:midi/capture_2 15:30:31.868 *Could not connect to JACK server as client. - Overall operation failed. - Server communication error*. Please check the messages window for more info. 15:30:31.876 Shutdown script... 15:30:31.876 /usr/local/bin/unloop2jack.sh JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out Driver is not running Cannot create new client Cannot read socket fd = 21 err = Success CheckRes error JackSocketClientChannel read fail Cannot open qjackctl client JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock Unknown request 4294967295 CheckSize error size = 0 Size() = 12 CheckRead error JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out Driver is not running Cannot create new client Cannot read socket fd = 5 err = Success CheckRes error JackSocketClientChannel read fail Cannot open jack_disconnect client JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JACK server not running? Unknown request 4294967295 CheckSize error size = 0 Size() = 12 CheckRead error JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out Driver is not running Cannot create new client Cannot read socket fd = 5 err = Success CheckRes error JackSocketClientChannel read fail Cannot open jack_disconnect client JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JACK server not running? Unknown request 4294967295 CheckSize error size = 0 Size() = 12 CheckRead error JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out Driver is not running Cannot create new client Cannot read socket fd = 5 err = Success CheckRes error JackSocketClientChannel read fail Cannot open jack_disconnect client JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JACK server not running? Unknown request 4294967295 CheckSize error size = 0 Size() = 12 CheckRead error JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out Driver is not running Cannot create new client Cannot read socket fd = 5 err = Success CheckRes error JackSocketClientChannel read fail Cannot open jack_disconnect client JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JACK server not running? Unknown request 4294967295 CheckSize error size = 0 Size() = 12 CheckRead error 15:30:52.344 Shutdown script terminated successfully. 15:30:52.344 JACK is stopping... Jack main caught signal 15 8<----------------------------------------------------------------------------------------------------- Many thanks, Thomas