When you power on the MPC, you’ll be prompted to choose between Demo, Template, or New Project.
Selecting New Project opens a session with no recorded audio or MIDI data and automatically loads a default kit onto the first track. This kit is intended to help you start making music right away.
If you’d prefer your projects to open without any default kit or sounds, adjust the following setting:
Menu > Preferences > Project Load/Save tab > New Project Behaviour > Empty Project.
Now, when you create a new blank project, the default kit will not be loaded.