"Darn, I'm out of orange juice." The sound of these words is probably represented in your auditory cortex, as though you'd heard someone else say it.

Note for accuracy:

If something puts a significant strain on short-term memory, it does indeed end up relying on the "inner voice" for extended/improved storage.

However extending this to "Darn, I'm out of orange juice." is unfounded and depending on a particular person, false to a greater or smaller degree.