A 17 minute cinematic piece,
primary instrument being the LMMS effect:

echo feedback delay line,

coupled with piano and that excellent LADSPA calf reverb
as well as the DJ flanger
plus all those other wonderful LMMS goodies too

https://old.bitchute.com/video/ztC7VfAuOizN/

But you will need 17 minutes to ponder the math in the video.
;-j