Thank you very much for your answers and for helping me understand this program! But, I haven’t succeeded yet. I’ve tried different options. I will also try to describe my task.
Here is a solution that I can use to solve this problem. It’s ugly, but it shows what exactly I want to get.
On the left side (which is inside the loop region) are the sequentially played sounds (almost the same as the sequentional multi-instrument mode).
The four multi-instruments on the right are the same copied multi-instrument.
The transition markers on the left have an approximately 30% chance of triggering. Transition markers on the right are always triggered.
To describe in general what I have achieved this way: the sounds on the left go one after the other. Sometimes the transition is triggered and one random sound from the multi-instrument is played between them. Then the cursor moves back and the sounds are played further.
This is what I wanted to do with two instruments - one in sequence mode, the other in random. It would be nicer and more logical. But there’s a problem.