Thanks for taking the time to reply. One of your suggestions crossed my mind, using wireless headphones to stream from the sound card in my Hercules Controller (of course additional gear, costs etc).
And I can appreciate the latency issue for strict beat matching. On the other hand, previewing a track just to verify it's the one I want, or to check a few things is still useful.
Since you wrote:
With the right settings, you can stream a track from your computer to your device, and listen to it with your headphones plugged into the iPad.
... can you elaborate on what the right settings are? I haven't been able to stream any audio to the headphones plugged into my iPad...