Well I can never say for certain that it's "beings". But I experience a lot of verbal mess in the back of my mind with all the psychedelics. I have full blown conversations with weed, voices which I can not control, these sometimes scare me, but I've made friends with them.
With shrooms, ayahuasca and Hawaiian baby woodrose I get different languages, all sorts of talk. I tend to sing or speak in tongues on these 3, and sometimes have conversations with myself in these languages. The speed and nature of the thoughts you have on psychedelics are such that they are too difficult to put in the English language, but when I speak in these foreign tongues and when I listen to them, they make perfect sense and really help to get the messages across.
On a high dosage HBWR trip, I went into a strange trance which I don't remember much of, but I was talked to through mayan imagery and a strange language and I'm pretty sure If I came back from it I would have some very profound knowledge of my ancestral roots.
With ayahuasca I've always noticed a sort of entity, very well disguised, it seems to me like it's a society which has been able to exert some influence over space and time and has created itself as DMT and is researching us, or trying to do something with us. When I vomited, the word "Zanarians" came to my mind and I "knew" that this was what these lifeforms called themselves. "Equanox" was also mentioned, I transpired it down to "equinox"... and I'm still pondering that one.
What about you?