Project
The Turbo Play project contains almost everything that a project contains. It can contain unlimited Scenes, which can contain unlimited Tracks, which can contain unlimited Parts.
A scene can also contain unlimited Bays which can contain parts not yet placed in the Arranger. Tracks and parts can contain unlimited Effects.

Turbo Play names the project "project.tp2" and it also saves periodically recovery projects (recovery1.tp2, recovery2.tp2) in case something happens and you haven't saved your work.