double clicking a track will bring up the sound browser, this can be focussed on either the sound pool (per project, 128 sounds) or +Drive (per machine, thousands of sounds) - whilst focussed on the browser you can audition sounds for that track, pressing yes will load them in
clicking a track will only reveal the name now assigned to that sound stored entirely within the kit, this is a legacy of earlier activity only, that sound is not stored anywhere, it is baked entirely within the kit (although its source may well have been a +Drive sound originally)
If you want to swap out a sound within a kit, just tweak and save or load from the sound manager and save into the kit
sounds like you may benefit from a refresh read on some ideas about sounds, kits, patterns etc from the manual or read the advice in the many threads on this topic 
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