lpminimk3 not working in raspberry pi

[pitzer]

I'm trying to use the Launchpad Mini MK3 on a Raspberry Pi 4 and struggle getting it to work.

Installed lpminimk3 using

$ pip install lpminimk3

Running the example gives me the following error:

$ python3 -m lpminimk3.examples.hello
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 188, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/usr/lib/python3.9/runpy.py", line 111, in _get_module_details
    __import__(pkg_name)
  File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/__init__.py", line 81, in <module>
    from .device import LaunchpadMiniMk3, find_launchpads  # noqa
  File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/device.py", line 3, in <module>
    from rtmidi import MidiOut, MidiIn
  File "/home/pi/.local/lib/python3.9/site-packages/rtmidi/__init__.py", line 4, in <module>
    from ._rtmidi import *  # noqa
ImportError: libjack.so.0: cannot open shared object file: No such file or directory

After installing the libjack-dev dependency it seems to require a JACK server

$ python3 -m lpminimk3.examples.hello
Traceback (most recent call last):
 File "_rtmidi.pyx", line 1023, in _rtmidi.MidiOut.__cinit__
RuntimeError: MidiOutJack::initialize: JACK server not running?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
   return _run_code(code, main_globals, None,
 File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
   exec(code, run_globals)
 File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/examples/hello.py", line 21, in <module>
   main()
 File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/examples/hello.py", line 12, in main
   lp = find_launchpads()[0]  # Get the first available launchpad
 File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/device.py", line 314, in find_launchpads
   midi_out = MidiOut()
 File "_rtmidi.pyx", line 1025, in _rtmidi.MidiOut.__cinit__
_rtmidi.SystemError: MidiOutJack::initialize: JACK server not running?

After installing jackd and running it using

$ jackd -d alsa

Results in not finding the lp mini:

$ python3 -m lpminimk3.examples.hello
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/examples/hello.py", line 21, in <module>
    main()
  File "/home/pi/.local/lib/python3.9/site-packages/lpminimk3/examples/hello.py", line 12, in main
    lp = find_launchpads()[0]  # Get the first available launchpad
IndexError: list index out of range