When you delete an audio track in Pro Tools, any clips that were in the track will output a silence, as there is no longer a destination for their audio to be routed to. This is because when you delete a track, you are essentially removing it from the session's routing path. However, the clips themselves are not deleted, and can be relocated to another track or removed from the project entirely. It is important to double-check your session after deleting a track to ensure that all necessary routing and signal flow still exists.