thx for answering
i copy the stereo Wave file with UTool2 on the usb drive (same es the mono files für MT mode). Then i but the USB drive in the lp 16 an turn it on. it star in MT mode and works well. then i switch witch the mode butten in the ST mode. there is the list witch steh stereo wave files. when i choose a song to play a small horglass appear and disappear and nothing happen.