Seboos

Hi, I'm a newbie, I bought the CT-X3000. I formatted the flash drive in the keyboard. I copied the .mid file to the MUSICDAT folder, as well as the .cm2 file converted from the .mid file using "CASIO smf converter". I have shortened the file name to 2 characters. Every time after "LISTING" I have ERR NO FILE error. What am I doing wrong? BTW, what application do you recommend on the iPad for playing MIDI keyboard music with song lyrics?