Suddenly it came into my mind a system that I had for a while that has 2 USb and 2 Sd card reader. I told him I had for quite a while, you could do the time setting on the screen so you don't use a timer anymore. He was amazed.He said many farms' owner are looking for it.
Best of all this system could store the sound memory , which means when you slot in a SD card you could store the sound into it and by controlling the timer in this sound system you can select which sound to play at which hour. Even you remove the card it still can play the sound that you had installed earlier.
It also has the ability to play 2 sound at one time. This mean one out-put channel could be set to playing external sound and the other one could play external sound. There are 3 LCD screens on it for pre-select sound, timer and channel out-put sound control.
For those who are interested please email me.