Originally Posted by Km6543
If your budget allows try a Zoom mixer. I have an R24 but an R16 will probably work too. You should be able to plug the drum module directly in and record, and save the recording as a WAV file. Then you sync the audio and video using video editing software. That's how I do it. The sound quality is quite good.
Another good idea, but Mixers are even more expensive than a Q3, which as todd said will record the video and audio simultaneously.
I think I'm gonna have a think about it and the budget I can realistically put forward to a bit of fun on Youtube. I'll probably save up for a Q3 or mixer, as midi to USB with garageband drums isn't going to sound the best.