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Rui F Ribeiro
Rui F Ribeiro
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Following on from the current end-state of "JACK starts if the interface is set to hw:PCH or hw:PCH,0, but I don't have any speakers except on my screen, which is on my graphics card's HDMI, so I'm not sure there'd be any point.", I:

  • Found some terrible old headphones
  • plugged them into my computer's built-in headphone jack
  • ran a2jmidid -j default
  • set JACK's interface to hw:PCH
  • Hooked up various connections in JACK following this guide
  • successfully recorded some random noises on the (MIDI) keyboard
  • played them back through the headphones.

So my remaining issue is that it's still producing the error in the question when I try to point JACK at my graphics card's HDMI audio-out instead. Since I don't have separate speakers or other not-built-into-my-monitor audio output, that's still a problem, for which I will leave this question open. In the event that nobody has an answer for that, hopefully this answer will at least help other people without my restrictions get set up.

Following on from the current end-state of "JACK starts if the interface is set to hw:PCH or hw:PCH,0, but I don't have any speakers except on my screen, which is on my graphics card's HDMI, so I'm not sure there'd be any point.", I:

  • Found some terrible old headphones
  • plugged them into my computer's built-in headphone jack
  • ran a2jmidid -j default
  • set JACK's interface to hw:PCH
  • Hooked up various connections in JACK following this guide
  • successfully recorded some random noises on the (MIDI) keyboard
  • played them back through the headphones.

So my remaining issue is that it's still producing the error in the question when I try to point JACK at my graphics card's HDMI audio-out instead. Since I don't have separate speakers or other not-built-into-my-monitor audio output, that's still a problem, for which I will leave this question open. In the event that nobody has an answer for that, hopefully this answer will at least help other people without my restrictions get set up.

Following on from the current end-state of "JACK starts if the interface is set to hw:PCH or hw:PCH,0, but I don't have any speakers except on my screen, which is on my graphics card's HDMI, so I'm not sure there'd be any point.", I:

  • Found some terrible old headphones
  • plugged them into my computer's built-in headphone jack
  • ran a2jmidid -j default
  • set JACK's interface to hw:PCH
  • Hooked up various connections in JACK following this guide
  • successfully recorded some random noises on the (MIDI) keyboard
  • played them back through the headphones.

So my remaining issue is that it's still producing the error in the question when I try to point JACK at my graphics card's HDMI audio-out instead. Since I don't have separate speakers or other not-built-into-my-monitor audio output, that's still a problem, for which I will leave this question open.

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Vivian
Vivian
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Following on from the current end-state of "JACK starts if the interface is set to hw:PCH or hw:PCH,0, but I don't have any speakers except on my screen, which is on my graphics card's HDMI, so I'm not sure there'd be any point.", I:

  • Found some terrible old headphones
  • plugged them into my computer's built-in headphone jack
  • ran a2jmidid -j default
  • set JACK's interface to hw:PCH
  • Hooked up various connections in JACK following this guide
  • successfully recorded some random noises on the (MIDI) keyboard
  • played them back through the headphones.

So my remaining issue is that it's still producing the error in the question when I try to point JACK at my graphics card's HDMI audio-out instead. Since I don't have separate speakers or other not-built-into-my-monitor audio output, that's still a problem, for which I will leave this question open. In the event that nobody has an answer for that, hopefully this answer will at least help other people without my restrictions get set up.