I guess this one goes to all the DJs on here -- which is just about everybody apart from me it seems.

Anyway, I downloaded some free Virtual DJ software so I could mix together some of my tunes, and I was just wondering what the general consensus was regarding when you swap bass? Is it better to swap bass very quickly on the beat, or try and slowly fade one out while you bring the other in? I'd prefer the second way because I'm also a bit of secret prog-house fiend, so I like all that seamless mixing malarky, but I always seem to get a moment when the two bass sounds are clashing. Is there any way to avoid that?

Any and all advice much appreciated, and don't worry, I'm not planning on inflicting any of my mixes on the world!