OK so I have a couple Laser Star projectors. Quite a cool little toy like a blisslight. It has a "Nebula" wheel that shines an array of blue LEDs through two pieces of Lumia glass and a diffraction grating for a green laser that makes lots of little starfield like dots all over the place. In one...
There is a DIY soundcard DAC route and LaserBoy is free, but that will be a good bit more of a hands-on option. Judging by your description above, it sounds like the QS/FB3 would be perhaps the easiest path moving forward as Things has recommended.