Hi Trevlyns, thanks for your information.
But honestly, I don't understand it properly, because I can't get the right result.
I clicked the "all channels", and I get the drum track with the "sub-tracks", but they are just empty. Everything is still only in the main track, and also the track volume is shown only on the main track.
In the attached image, you can see my situation, with the channels on, and the empty sub-tracks in the background.
Could you just give me any information more, dumb-proof?