GMaq,
They say a picture is worth a thousand words, and while the graphic you provided was not the same as the startup screen I had, it did give me a clue as to where to start looking. Thank you very much.
I had to chose Advanced Options from that screen and then set up persistence from there, and that took two attempts due to me being clueless about the process.
While the file firmware-misc-nonfree did list the 'Tiger Lake' card there was no sound without the firmware-sof-signed installed.
Once that was installed after using the Synaptic markings file I had originally created in Synaptic (without rsync from my installed SSD:/var/cache/apt) - viz. all downloaded from the web based repos), and after a reboot, I have sound of sorts - with QJackCtl somewhat like the static between shortwave radio stations - fluctuations in white noise. That is from mpv Media Player, VLC and LMMS with QJackCtl loaded.
The command alsamixer and 'alsmixer 0' always defaults to a single bar in the center, even though I have gone through the process of F6 > choose Sound Card 0 - sof-hda-dsp > Esc > sudo alsactl store 0. Without the sudo, alsactl returns 'alsactl: state_lock:125: file /var/lib/alsa/asound.state lock error: File exists'. Sadly, it would appear as if even the sudo in front doesn't 'store' the card info, but the device levels are stored, after F6 > choosing the sof-hda-dsp option???
QJackCtl setup does store the card info and all other setting / options have been left as default.
If I shut down QJackCtl, I can play mp3 through Audacious, but videos through VLC and mpv Media Player, only the synth sounds / music on the videos is heard, but the commentary is again the odd pops, cracks and squeaks with nothing intelligible. LMMS likewise, after re configuring for PulseAudio and ALSA-Sequencer, will play acceptable sounds. Using 'aconnetgui' to connect my Akai APC Key25 MIDI controller, the keys do work, after a fasion. Single and double notes sound OK, but a cord of three notes turns into noise again - tonal - higher or lower frequency, but noise. A small improvement over having QJackCtl running.
LMMS using ALSA Audio interface, there was no sound.
I rebooted the USB and checked the items listed above;-
Using alsamixer 0 still shows a single bar in the center, those settings are not being stored.
Without QjactCtl - mp3 through Audacious is fine. LMMS with the working settings above - single note OK, but adding a second note now plays a somewhat de tuned lower note, such that C5 as the 1st note, while holding C5, press G6, and it will sound like C4?? Videos through VLC and mpv Media Player, only the synth sounds / music on the videos is heard, but the commentary is again the odd pops, cracks and squeaks with nothing intelligible.
Start QJackCtl - mp3 through Audacious and mpv Media Player is single tone noise. Video through VLC, after reconfiguring for Jack and restarted, plays audio of single tone noise overlaid with static pops, and likewise mpv Media Player. LMMS, after reconfiguring for Jack and restarted, again produces tonal noise - higher or lower frequency based on key used.
I booted into my Debian 11 installation.
While the video players gave the same results as both installations of AVL (SSD & USB), the audio players worked immedialy and flawlessly.
Since LMMS now supports ALSA & Pulseaudio, I installed LMMS, and alsaconnectgui. and connected the Key25. LMMS again played single note OK, but adding a second note now plays a somewhat de tuned lower note, such that C5 as the 1st note played, while holding C5, press G6, and it will sound like C4?? Add at third note to the cord and tonal noise is the result. For some reason the keyboard seems to have sifted. If I play the LMMS instrument keyboard (Triple Osc.), C2, I get something not much higher than a cat's purr. When I try to play the MIDI keyboard, I have to press the 'OCT UP' button twice to get what I would normally know as middle C.
I thought that maybe some classical music might yeald some 'glitches' but Mozart's Horn Concerto played flawlessly, so it is not the complexity of the sound.
From where I am siting in all this, it looks like the firmware is not interacting correctly with the DSP / Tiger Lake, but what would a mere user know about these things,
The only other thing might be faulty hardware, and I had hoped that Debian 11 might have told us something different and confirmed the hardware was good, but ....??? A thought that I would rather avoid, if possible, with all the road flood damage locally.