No, no game maker here. This is a completely custom engine written from scratch. It's actually quite nice and powerful, more like Unity but for pixel art games. It's done completely with pure c++ and hot-reloading for everything with a minimal set of dependencies which suits me nice, no dependency on any third party engine that breaks the game.
Someday I will probably open source it.
Detecting is not really the main issue, it's that I don't have Windows 7 around to test it :) But it sounds like XAudio is the way to go. It's much more performant anyway and I would want it to be the default.