Thanks Lukas, you don’t need to give out information about your future plans, we already saw that your plans are not even close to bring basic functionality to the windows version, meaning having a proper SEARCH for mp3, easy pre-listen cue not involving a MONO output, left for main sound, right for monitoring or a multiple out semi-pro audio device.
Don’t worry, as long as Mac users continue to buy this product you are safe.
Windows users: please don’t fall for this. Use VDJ8 (same price) or any other software, the Spotify advantage on djay Pro can be easily circumvented using Applian tools (including automatic mp3 tag insertion) and some planification before the gig (which songs will you need from SP?)
Seriously, you already showed that still don’t have enough knowledge to develop windows products, you can’t even handle more than one soundcard at the same time and that’s really basic, see that every other program has this, one card for main sound output and the other for pre-listen/cue o whatever you call it 
Anyway, things can change and if you invest a lot of time and effort you can finally develop a great windows app, not this faulty toy. I hope to get back to you in a few months and tell you I was wrong… untill then, so long!