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Oh, I forgot, one possibly useful clue:
I noticed that when connecting jack audio outs of drumkv1 to system.playback ins, it (both qjackctl and qtractor connections) refused to connect drumkv1.out_2 to system.playback_2. It drew the connection line and then a fraction of a second later erased the line. This also happens every time.

One time it emitted this message:
cannot complete execution of the processing graph (Resource temporarily unavailable)
jack_client_thread: graph error - exiting from JACK
but I think that time it crashed with SIGSEGV. This was before I build it with debug