Diki,
Even though your playlist is limited to 399 files, you don't have to swap out thumb drives. You can have many playlists on a single thumb drive.
John, if you are looking to purchase a sonic cell, please let me know. I have them for sale at my store and can give very competive prices.
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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com