It seems that second intitation was a recognizable stage that people went through to get to enlightenment. The way I tried to explain it is that there are different levels of the inner light and sound. It's the lowest level that you can perceive first, which is quite close to this physical level.
When you have meditated on this lowest level of the inner light and sound you can become aware of the next highest level. You can get to higher and higher levels, then you get stuck. The reason why you get stuck and find it difficult to get to higher levels is that the mind can perceive levels lower than its self or at the same level. The mind cannot perceive levels higher than itself.
So you have to perceive these higher levels with something other than the mind. When that happens you realize that everything you thought was you is not you. This can take a while to get used to. Do you think this is accurate?
When you have meditated on this lowest level of the inner light and sound you can become aware of the next highest level. You can get to higher and higher levels, then you get stuck. The reason why you get stuck and find it difficult to get to higher levels is that the mind can perceive levels lower than its self or at the same level. The mind cannot perceive levels higher than itself.
So you have to perceive these higher levels with something other than the mind. When that happens you realize that everything you thought was you is not you. This can take a while to get used to. Do you think this is accurate?