Track 1 is jammed

Track 1 plays back a sound even when the slot has been cleared. no matter what sample i load it cant be previewed or triggered in grid recording, where is this sound coming from? i am not using midi or a pc.

Does that still happen if you create a new empty project?
Sometimes stuff gets weired and creating a project from scratch helps you to get ouf of the madness.
It is basic but it helps…
regards

F.