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I want to set some MIDI from a MIDI keyboard on a loop using a sequencer, and it seems like seq24 would be the simplest way to do this. However, seq24 doesn't show up in JACK connections, and I don't know how to connect my keyboard to it. It also doesn't play sound when I use the on-screen input (probably is related to not showing up in JACK). How do I fix it? thanks!

If another program is better, I'd use that too. I have qtractor and rosegarden installed, but I don't know how to loop things with those programs without copying and pasting..

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Try starting seq24 with the -m option or edit $HOME/.seq24rc and look for the [manual-alsa-ports] section. It should be set to 1.

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