Gabriel Rios - Swing Low.

The world of voice-hearers is the life state attained by those who gain a partial awakening through hearing the Buddha’s teaching.

The world of cause-awakened ones refers to the life state attained by those who gain a partial awakening through their own observations and effort. It is also called the realm of self-awakened ones.
I'm not propagating New Age thought, I just want to shed a light on the so-called voice-hearers, so widely misunderstood in the West.
Thank you Gabriel Rios for your effort.
https://sokaglobal.org/resources/study-materials/buddhist-study/the-basics-of-nichiren-buddhism-for-the-new-era-of-worldwide-kosen-rufu/chapter-2.html#:~:text=The%20world%20of%20voice-hearers%20is%20the%20life%20state%20attained,their%20own%20observations%20and%20effort.