You guys are not getting my point.

Yes, I can select a drum kit for any track. But the problem is when you revisit a track.

Let's forget about the drum kits, take any sound. for example, on Track 1, I select piano, then select Main (now the main part has the piano sound). I finish recording 8 meaures. Then I go to track 2, select a bass sound, now again I have to select which part (main, layer or left), I select main, (now main part is set to bass). I record 8 measures in four or five tracks like this using different sounds.

Now I find that I need to over dub piano track (track 1). I select that track to be recorded, now again I have to select which part, now this step is stupid.... If i select main, it will change the sound to whatever sound was select for Main part last. Why do we have to select a part???