So I just bought kiai for 1 tc at the market and tryed to put a sound on it, the file type was mp3 but its says that i need to put it in riff container or something.

How can I do that ? is there any website where I can convert mp3 to riff ?

it must be a .wav files less then 5 seconds try 4.8 seconds you can easily convert and slice up your mp3 in easily I use

http://www.acoustica.com/mp3-audio-mixer/

also you raise the volume if your kai sound is not sound loud enough very simple you only need the free version

if you can't do this I will do it for you just name the song and what 5 seconds you want

free for good cause:3

I advise using Audacity for handling TB sounds, export using the default settings for .wav & you'll have a perfect file.