NuVJ background - the extra half-channel
Ok this might not be a "secret" as such, but so far no NuVJ users I've spoken to have ever mentioned it and it was only as I was digging through the manual to see if there was anything I missed that I stumbled across it...yes, it's official, RTFM does occasionally work.
You know there's background layers on NuVJ - yes? In the preferences you can specify a clip to use as a background... ok great, but it's a bit fiddly browsing for a clip each time, right?
Well you don't need to. You can just drag a clip from one of the banks or even directly from the file explorer directly onto the central preview panel to set it as the background layer.
The background layer isn't a true 3rd channel though. There are restrictions...you can't adjust the speed, you can't apply individual effects (although the master fx still works on it), and it's pretty much on or off so you need to think a little about how you introduce it rather than just dropping it in there, but it *is* an extra channel.
If you go into the preferences and on the "advanced" tab make sure that "Use mask and copy mode on deck A" is ticked, then you can use the multiply/add transfer modes or even the luma/chroma-keying to add transparency to *both* your A and B decks.
What that means is that you could have a background layer playing, then some luma-keyed particles on deck A over the top of the background, and then some bluescreen (chroma-keyed) logo or something on deck B, giving you an effective 3 layers.
Background layer plus two semi-transparent layers on NuVJ
Given the limited amount of control you have over the background layer you need a controllable entrance and exit. It's always a good idea to have some clips without transparency handy so that you can take the focus back to a single clip if you need to change or remove the background layer.