I just checked the doc here (https://www.specnext.com/turbo-sound-next/), it seems quite easy to adapt the player to the Spectrum Next. I’m just not sure how the independent noise channels work, but this shouldn’t be a problem.
Actually, if you’re in a hurry, you can use the already existing AKY player for 9 channels and adapt the player, it should work quite easily (but don’t worry, I’ll take care of that eventually).
As for the independent FX player, it’s in the pipeline.
It is over and ready. I intend to release all this for next version. Can you wait two-three weeks more? I had many requests lately, and still a few bugs to correct, plus the packaging to recreate (quite a lot of new files!).