Also make sure your user can read and write to raw USB devices.
See [this Mixxx wiki page](http://mixxx.org/wiki/doku.php/hercules_dj_control_mp3_e2#usb_hid) for how to do this with udev-based systems (almost every Linux distribution).
Currently, the driver must be started after you plug in a device.
Just run `hdjd` and it will tell you what it found.
Current Issues
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The driver is pretty crappy right now.
If you email me, I'm a lot more likely to fix things.
Even if you just say "hi, I'm using your Hercules driver".