Conversation so far:
part of the inner ear that controls balance
The vestibular system is the part of the inner ear responsible for balance.
what part of the ear is responsible for sound detection?
The cochlea is the part of the inner ear involved in hearing.
what are the three chambers within the cochlea?
The three chambers within the cochlea are the vestibular duct, tympanic duct, and cochlear duct.

Question: where is the duct located?
Self-contained rewrite: where is the vestibular duct located?