Hey Alinka!
First and most important: I don´t know if you can modify that particular behavior
Maybe some more experienced users could chip in.
BUT:
You can also change the level of the sample in the audio edit menu. Open the sample management for the track you want to affect [FUNCTION]+[PLAYBACK] and then press [FUNCTION]+[EDIT] (its the bank key), the menu for your audio file should open. You can now use the setup keys under the sreen to flip through different pages, somewhere there you can affect the level of the chosen sample and a lot of other stuff.
ALSO IMPORTANT:
The OT will stretch the sample to your chosen BPM, it will always sound different if you don´t dial in the original BPM. You also can turn that off/on in the menu I explained above.
Everything about the audio editor you can find on page 96 of the OT manual!
Hope I could help a little, and if not… at least I tried
Greetings, JX
PS: Be aware how loud the rest of your whole setup is. Sometimes your mind is so tangled up in your thinking that you forget to turn up your monitor speakers/the mixer/whatever you´re using
Happened to me numerous times!