ok what u gotta do is:
when u hit on the bonga,it activates a switch,which tells its inner circuitry u just hit that bongo,all u gotta do is find that switch and wire up your led's to it,maybe even using a transistor and a 9v battery so's ur led's dont choke the power going back to the mainboard meaning yeah u got led's but the bongo dnt work lol,u can get mini transistors in like every electronics shops,make sure u get one that is suitable btw dude!and make sure u put a proper resistor on afterwards so u dont blow ur led's real quick,and dont worry bout the battery running out,the light isnt only constantly its only flashing once in a while whn u hit the bongo's so it should last about 6 months depending on the amount of led's u put in there and their power consumption