Looking at the specs on Gemini’s site, it does say “PC/MAC Audio interface (up to 24-bit/192 kHz),” so I would expect that should work as a sound card with Mixxx (which will work with any sound interface device that your OS can reference)… though how good it will support it as a controller is an entirely different covnersation.
It is not one of the controllers that will just work automatically with Mixxx, it will require you to create the map yourself – and boy, you think people complain about how complex it is to get a mapping to work in Traktor? Mixxx is actually work – it has a learning wizard, but it’s not going to be a terribly satisfying mapping. You will have to hack the XML specification to really get your controller working properly, which is not exactly programming, but for the non-computer-geeks, it’s going to be close enough to not be a fun thing.
Mixxx is great software for what it is, and has finally gotten feature complete enough to be ready for prime time, but it is open source software, which is both its strength and its weakness… if you are a geek and can handle hacking around with your software to get it to do what you want, then you are going to have a lot more control over how Mixxx works, and if you’re good enough, you can even add your own features to it… a real strength. However, if you’re not a hardcore geek, then you are going to have a hard time using it to its full potential.
As for Serato, I don’t see it listed as a supported device in any way whatsoever on their website, so… that’s probably not a very simple path to follow.
While the Traktorpocalypse has been foretold by many (whereby Native Instruments will decide that thou must owneth official hardware if thou wishest to play in their ballpark), at least for the time being, it should work with your controller as both audio interface and controller… but, you may be painting yourself into a corner.
I would think, if you aren’t already committed to a software selection, that you might want to instead take a look at Mixvibes or VirtualDJ. Those both seem much more likely to be something you can get up and working with your controller, without risking them dropping support for you completely at some point down the road.
That said, a lot of what I’ve said here is conjecture or opinion, so be sure you use this as guidance for your own research rather than just considering it as having done your research.
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