What is an audio engine and what are these messages telling me?

Both of my mics and my keyboard are showing up in the Ardour Editor, but no sound , no movement in record.

:39.030 D-BUS: JACK server could not be started. Sorry

Cannot connect to server socket err = No such file or directory

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 = No such file or directory

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

09:31:39.137 ALSA connection graph change.

Sun Dec 13 09:31:38 2020: Starting jack server...

Sun Dec 13 09:31:38 2020: JACK server starting in realtime mode with priority 10

Sun Dec 13 09:31:38 2020: self-connect-mode is "Don't restrict self connect requests"

Sun Dec 13 09:31:39 2020: Acquired audio card Audio2

Sun Dec 13 09:31:39 2020: creating alsa driver ... hw:U192k,0|hw:U192k,0|1024|2|44100|4|2|nomon|swmeter|-|32bit

Sun Dec 13 09:31:39 2020: configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods

Sun Dec 13 09:31:39 2020: ALSA: final selected sample format for capture: 32bit integer little-endian

Sun Dec 13 09:31:39 2020: ALSA: use 2 periods for capture

Sun Dec 13 09:31:39 2020: ALSA: final selected sample format for playback: 32bit integer little-endian

Sun Dec 13 09:31:39 2020: ERROR: ALSA: cannot set channel count to 2 for playback

Sun Dec 13 09:31:39 2020: ERROR: ALSA: cannot configure playback channel

Sun Dec 13 09:31:39 2020: Released audio card Audio2

Sun Dec 13 09:31:39 2020: ERROR: Cannot initialize driver

Sun Dec 13 09:31:39 2020: ERROR: JackServer::Open failed with -1

Sun Dec 13 09:31:39 2020: ERROR: Failed to open server

Sun Dec 13 09:31:40 2020: Saving settings to "/home/dirk/.config/jack/conf.xml" ...

09:31:43.963 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.

Cannot connect to server socket err = No such file or directory

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

From ARDOUR ;

[ERROR]: LADSPA: cannot load module "/usr/lib/ladspa/fmod_1656.so" (/usr/lib/ladspa/fmod_1656.so: undefined symbol: __expf_finite)
[ERROR]: LADSPA: cannot load module "/usr/lib/ladspa/autotalent.so" (/usr/lib/ladspa/autotalent.so: undefined symbol: __exp_finite)
[ERROR]: LADSPA: cannot load module "/usr/lib/ladspa/amp_1654.so" (/usr/lib/ladspa/amp_1654.so: undefined symbol: __expf_finite)
[WARNING]: Ignoring invalid LV2 plugin http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_
[INFO]: VST Blacklist:
/usr/lib/vst/carla.vst/libcarla_interposer-jack-x11.so
/usr/lib/vst/carla.vst/libcarla_utils.so
/usr/lib/vst/carla.vst/libcarla_interposer-x11.so
/usr/lib/carla/styles/carlastyle.so
/usr/lib/vst/carla.vst/libcarla_native-plugin.so
/usr/lib/vst/carla.vst/carla-bridge-lv2.so
/usr/lib/vst/carla.vst/libcarla_interposer-safe.so
/usr/lib/vst/lsp-plugins-lxvst-1.1.13/lsp-plugins-vst-core-1.1.13.so
/usr/lib/vst/lsp-plugins-lxvst-1.1.13/lsp-plugins-r3d-glx.so
-----
[WARNING]: Ignoring duplicate Linux VST plugin MaGigaverb
Ignoring duplicate Linux VST plugin MaBitcrush
Ignoring duplicate Linux VST plugin MaPitchshift
ardour-request-device binary was not found..'
[WARNING]: AlsaAudioBackend: adjusted output channel count to match device.
[ERROR]: VST '/usr/lib/vst/PingPongPan-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/3BandEQ-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/3BandSplitter-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/MaFreeverb-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/ProM-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/MaGigaverb-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/glBars-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/carla.vst/CarlaPatchbay64.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/carla.vst/CarlaRackFX.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/carla.vst/CarlaPatchbayFX.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/carla.vst/libcarla_interposer-jack-x11.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/carla.vst/libcarla_interposer-jack-x11.so': load failed.
VST '/usr/lib/vst/carla.vst/CarlaPatchbay32.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/carla.vst/libcarla_utils.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/carla.vst/libcarla_utils.so': load failed.
VST '/usr/lib/vst/carla.vst/libcarla_interposer-x11.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/carla.vst/libcarla_interposer-x11.so': load failed.
VST '/usr/lib/carla/styles/carlastyle.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/carla/styles/carlastyle.so': load failed.
VST '/usr/lib/vst/carla.vst/libcarla_native-plugin.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/carla.vst/libcarla_native-plugin.so': load failed.
VST '/usr/lib/vst/carla.vst/CarlaPatchbay.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/carla.vst/CarlaRack.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/carla.vst/carla-bridge-lv2.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/carla.vst/carla-bridge-lv2.so': load failed.
VST '/usr/lib/vst/carla.vst/libcarla_interposer-safe.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/carla.vst/libcarla_interposer-safe.so': load failed.
VST '/usr/lib/vst/carla.vst/CarlaPatchbay16.so': e[31mCarla assertion failure: "fIsActive" in file carla-vst.cpp, line 410e[0m
VST '/usr/lib/vst/CycleShifter-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/SoulForce-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/AmplitudeImposer-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/lsp-plugins-lxvst-1.1.13/lsp-plugins-vst-core-1.1.13.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/lsp-plugins-lxvst-1.1.13/lsp-plugins-vst-core-1.1.13.so': load failed.
VST '/usr/lib/vst/lsp-plugins-lxvst-1.1.13/lsp-plugins-r3d-glx.so': [WARNING]: Cannot get LinuxVST information from '/usr/lib/vst/lsp-plugins-lxvst-1.1.13/lsp-plugins-r3d-glx.so': load failed.
VST '/usr/lib/vst/Nekobi-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/MVerb-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/MaBitcrush-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/Kars-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
VST '/usr/lib/vst/MaPitchshift-vst.so': e[31massertion failure: "fIsActive" in file ../../dpf/distrho/src/DistrhoPluginInternal.hpp, line 537e[0m
AlsaAudioBackend: Cannot use two different devices.AlsaAudioBackend: Cannot use two different devices.AlsaAudioBackend: Cannot use two different devices.AlsaAudioBackend: Cannot use two different devices.AlsaAudioBackend: Cannot use two different devices.LADSPA: cannot load module "/usr/lib/ladspa/fmod_1656.so" (/usr/lib/ladspa/fmod_1656.so: undefined symbol: __expf_finite)
[ERROR]: LADSPA: cannot load module "/usr/lib/ladspa/autotalent.so" (/usr/lib/ladspa/autotalent.so: undefined symbol: __exp_finite)
[ERROR]: LADSPA: cannot load module "/usr/lib/ladspa/amp_1654.so" (/usr/lib/ladspa/amp_1654.so: undefined symbol: __expf_finite)
[WARNING]: Ignoring invalid LV2 plugin http://guitarix.sourceforge.net/plugins/gx_colwah_#_colwah_
[INFO]: Loading bindings from /etc/ardour5/ardour.keys
Loading menus from /etc/ardour5/ardour.menus
[INFO]: Loading 88 MIDI patches from /usr/share/ardour5/patchfiles
[INFO]: Loading history from /home/dirk/Documents/TEST 1/TEST 1.history
[INFO]: TEST 1: no history file "/home/dirk/Documents/TEST 1/TEST 1.history" for this session.
[INFO]: AlsaAudioBackend: already active.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: already active.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.
[INFO]: AlsaAudioBackend: reload latencies.

First, why are you using JACK? It is not required, and is useful only if you plan to route audio and/or MIDI between applications or share the audio interface ebetween multiple devices.

Second, it seems that you also tried the ALSA audio/MIDI backend, and it worked.

Thank you Paul Davis. So Jack isn’t necessary for me to use my usb interface with 4 inputs, to record audio for podcasts, or music?
If I have tracks armed. record enabled, monitoring of a mic signal, and my keyboard signal lighting up, but no Master signal showing, what am I missing.
I am really new to recording in Ardour.
Thanks
WAIT! I just recorded a track! Woohoo! Now to continue reading the online manual…to figure out how to delete the recording from a given track. :slight_smile: :smile:
OK, I now understand that deleting a recording from a track is within Edit–>Remove Last Capture.