I will try to answer these important questions. What does it mean to communicate soul to Soul?
When you pray to God with your soul you are communicating soul to Soul.
You can also communicate with other souls as long as both have some soul development.
What is it like to perceive through the soul perceptions?
This is an ongoing thing and is developed as the Divine Love enters the soul, as This Love draws you closer to the Father, the mind gives way to the perceptions of the soul, and God appears as a real, existing Being, the Creator of all and His truths becomes a living reality for the one who perceives.
Are soul perceptions part of the Soul mind?
Yes, and they are dependent on the condition of the soul, as the Divine Love enters the soul, the soul perceptions enlarge and become as real as, lets say the perceptions of the eyes, they are the eyes of the soul.
What happens to the carnal mind, does the negative things in it go away?
The carnal mind becomes naught when the soul is transformed, then there is no place for the negative things that once was, never again will negative things be any part the transformed soul.