The OP is not a trick question.
This thought experiment is confined to sound only and not to vibrations or soundwaves.
The main principle of the OP is solely, can any of the effects (sound, taste, smell, touch, vision) of the senses exist without humans.
If you bring in soundwaves or vibration, then the question is, do soundwaves (vibrations) exist without humans to detect and measure it.
The answer is still, No.
The scientific theory, the whole set up of detecting, measuring and interpretating the soundwaves (vibrations) is still human dependent.
Note observers' effect.
Amen to that. If one believes in an external world beyond any and all consciousness that (for some reason) mimics the content of consciousness, one may discover, on reflection, that such a world (if it exists) mimics only the content of visual perception. There is no external world counterpart for non-visual perceptions (experiences).
Thus no, there is no experience of sound in the absence of experience itself. Thus there is no sound in a tree, falling in a forest, with no one around to hear it.
In the absence of experience, what, if anything, exists?