As of January 2019, the SYLOS project has been stated by Sparkles* to be "firmly on the backburner".
Biography and HistoryEditSparkles* and Martyn have always had a close relationship, with the two being roommates for much of 2015 and 2016. They have also collaborated musically before on various Yogscast projects. Martyn seems to primarily a vocalist.
Not much is known about ApproachingNirvana's relationship to the other two. Sparkles* met up with him for the first time in late 2016 in My Week Vlog #21. He is primarily known for making very electronic-heavy instrumental music, and has been a popular artist since at least 2012. For recent work, here is their SoundCloud link.
SYLOS has released one EP, consisting of one single and one B-Side.