I need to find a keyboard that will allow me to store wav or mp3 files on an sd card ( or via usb send the files to the keyboard's sd card) and map a key/button on the keyboard to play the wav / mp3 file. I need to map maybe 8 keys to perform this function and the sound files can be up to 1.5 minutes in length. this will be used at school for playing sound files via audio out to a PA the music for a dance routine. Or press a key and "Go Hawks Go" is played. Any ideas? Has to be cheap since this if for a school and I am going to buy it and donate it to the school. Hoping I could find one for $200 or less - maybe I am just dreaming!!! tx jim