Hi,

Here is what I have found in the USB stuff I have been doing:
1) Endpoints 0 (control endpoint on all USB devices) and endpoint 2 (Bulk data) are the only 2 endpoints the Empeg currently uses, endpoint 1 is indeed unused.

2) I believe all of the menus and navigation related to the player are controlled by the player.

3) The File Sync is controlled by the player app, for confirmation of this drop to a shell on the empeg (press q with a dev kernel loaded) then try to connect Emplode, it should fail to find your player.