The same technique was tested in my Kepong test BH and I am keeping a very close eyes on the response of those swiftlet in the area.
So far the effectiveness seems to be lasting.
For this particular sound testing I used an anchor sound A and played with two other non anchor sound B and C in the morning (from 7:00am till 1:00pm) while in the evening (1:00pm till 8:00pm) I used the anchor sound with B and D.
I was very happy to observe how those young birds will be flying in an out of the entrance window especially once there is a sound change from B,C and D to my anchor sound.
My recommendation is to line up your sound in the following sequence (the time indicated is for Peninsular Malaysia daylight hours):
7:00am : Anchor Sound A
8:00am : Anchor Sound A
9:00am : Sound B
10:00am: Anchor Sound. A
11:00am: Sound C
12:00noon: Anchor sound. A
1:00 pm: Sound D
2:00 pm: Sound D
3:00 pm: Anchor sound A
4:00 pm: Sound B
5:00 pm: Sound B
6:00 pm: Anchor sound A
7:00 pm: Anchor sound A
You can see that the morning session has more anchor sound A.
Why do you think I wanted it that way?
Usually it is the early part of the day when there will be lots of young birds that have just starting learning to fly for the first time will usually fly back after leaving the house. They will usually need some rest on the first day.
While flying back home your chances of pulling them into your BH is higher.
For the evening sequence, you can see that I proposed a new sound D to be placed from 1:00pm till 3:00pm.
Then you should break it with the anchor sound for the next one hour.
After that you put back sound B or C for two consecutive hours to make the birds get ready for the last two hours of your anchor sound.
This will make your anchor sound last longer.
If you have difficulties to arrange the above sequence or understand what I was trying to teach, please try to attend my December 3rd, 2011 Seminar at Eastin Hotel.
I will try to make sure every participant learn the technique until they know what to do.
There are still lots of empty seats and you should think what will happened to your BH once you apply the above sound rotation technique.
No other "Sifu" will allow you to know about this secret but ...........
Read this email from someone from Indonesia:
last time i was think that using that way, birds will encourage to fly through every corner of the house, and seems i was wrong sifu for external i did same way sifu, but the time is 5am-9am, 11am-1pm, 3pm-7pm (anchor sound) here for gmt +7
I don't really know what this guy does with the sound system at his BH but his last words seems to be what I was waiting for.