Immediately after installing those external sound tweeters those birds started to fly into the lower floor via the new Lubang Antara Lantai (LAL).
It was nothing to shout about but I was pretty sure this LAL makes life easier for those birds.
Now they can take a short cut as compared to prior to having this new LAL.
I am sure during the first few days or maybe weeks they will be adopting this hole as compared to flying out using the old path.
Usually they will be guided out of the BH by those morning light.
This time the morning light will be coming from the new LAL as compared to before.
Once they use this new hole they will normally use the same path when they flew out in the morning.
Some might still use the old path but eventually all will use the new path.
What I predict after having this new LAL, the lower floors will have a higher percentage of nests.
Let me monitor and confirm that what I predicted comes true.
The new flying in path to the ground floor wiht New LAL hole opened:
The old flying in path with no new LAL hole