I am not sure if I have any meaningful anecdotes regarding reading fiction. I do not believe I have seen or otherwise visually imagined the events in either fiction or non-fiction most of the time unless reading it made me recall something that I remember. It might be possible if I were actively trying to do that, but I can say that whatever experience I am extracting from reading fiction is not primarily due to being able to see it. If people are really imagining that sort of thing automatically, I feel pretty envious of that myself.
When it comes to sounds though, I am something of a captive in my own mind. For the majority of the period that I am awake and not highly focused, my mind is using approximately 98% of its resources to replay, construct, combine, and modify music. This is usually much more interesting than what I am hearing and what most people have to say to me, and it can require conscious effort to hear the latter. Unlike the images, this sound is of high quality and is not at all consensual. I have been told that this is not quite normal. In hindsight, this could have been a useful trait had I worked with it instead of worked through it.
*Assuming that these memories are not brought on through involuntary means, such as some drugs and trauma-induced flashbacks.