Hoping Andrea or Igor would have an intelligent answer to this rather than my unintelligent response.

I have recordings from Rode Wireless Go II wireless microphones. They do
not align, so my first inspirational thought was;

<https://youtube.com/watch?v=rOMKP4Jgzw8>

- load the two wav files
- try to add them as mixer
- mixer align


That does *not* work, CinGG refuses to open mixers for audio only tracks.
It does not really make sense.
 
When the mixer code was written, we did not even think about doing audio.  It would be a nice enhancement.
 
Can you work around this issue? Sure, create a one pixel PNG, and remux the
wav into an MKV and then CinGG opens it.

ffmpeg -loop 1 -y -i /tmp/rode.png -i REC00012.wav -shortest -acodec copy
/tmp/test1.mkv
...
So then the second part. Since my actual problem was that some parts of an
edited video contained horrible cracking, I wanted to cut the individual
pieces of that track, align it with the master audio track to fix the audio
without doing it by ear. This is the reverse approach of what is currently
seems to be possible. To overcome the issues with clips, I have cut out
clips using ffmpeg, and tried to align them. Lets say there is obviously
"Match All" which creates a nice segmentation fault (attached).
The dump keeps referring to "futex_abstimed_wait_common.../lib64/libc.so.6" so I think that is the problem but not sure what it even means.  Maybe Andrew has a hint.

But even
with manually specifying in the master track position, it dit not align for
me, until I manually dragged it to the matching audio position.

I would like to take a short clip, and align this with the master track.
This could increase workflow productivity, and would not require a single
master track anymore. At this moment clips in Cinelerra cannot be used as a
Mixer.
...
What I would like to learn; Is there currently a way to manually create a
master track to overcome the issues with audio (and clips)?

When you say you did "Match All", were you referring to using the concept in the manual at:
   https://cinelerra-gg.org/download/CinelerraGG_Manual/Audio_Video_sync_using_Wave.html