Check it with Aterm (cd /mnt; ls), it may be uba1 too... Also post your "dmesg | tail" after sticking that mp3-player in...I used usbViewer and it is showing up on there. It shows up as GMP33000S.
But wen i use emelfm.bin to find the USB device in the /mnt dir it does not show up. I can see my other usb devices but not my MP3 player. ; FAT32