If that doesn't work (assuming nautilus mounts it under /media
), create a text file in the player's root directory called .is_audio_player
(note the dot in front of the name):
That's what I had to do to my cheap mp3 player. Now, it plays fine from rhythmbox (and shows up under 'Devices').
You can 'google' .is_audio_player
to (hopefully) find out more.