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OK, i forgot what this was about, so yes, do continue testing and poking around.
Youtube will use graphic subsystem and that must use interrupts and other resources, causing spikes. Use integrated graphic, usually that works OK.

I wanted to see the stepper turn correctly, also to understand how ini and hal work if they are connected to each other. Honestly I would have liked to see the system turn with youtube active without errors.

I have a few observations:

no pulses are generated for reverse movement when the magazine turns in one direction the stepgen.2.position-cmd value changes by 400 then stepgen.2.position-fb and carousel.0.counts tend to this value. when the moment comes for reverse movement nothing changes in the three above parameters. despite the fact that the Dir pin changes there are no pulses - so for some reason the carousel component does not add pulses resulting from the set carousel reversing time. N .rev-pulse .
I do not know how the mechanism should work the instruction says carousel.N.rev-pulse float in
The duration in seconds for which a ratchet changer (Boxford, Emco) should pulse the reverse pin to lock the holder.
on logic so pulses in an indefinite number for a specified time possibly some mathematics could calculate that if someone wants the reversing to last 5 sec. and the pulse frequency is known, stepgen.2.position-cmd should be increased by the result of these calculations and the pulsation command should be issued.