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Pretty much. Many of the drum sounds in jungle and drum and bass were generated with drum machines like the Roland TR-808 in rap songs in the 1980s and then sampled and chopped about. Trance has always had a lot of synthesizer use to generate the sounds but I think much of it by the late 90s was done in software rather than on a big analogue synth with dials, switches and patch leads.
Definitely not. Just into electronic music and I've been making YouTube playlists and listening to it in the lab for a long time!
If you go back far enough, that's where the synth sound came from. There was the Moog synthesizer in the late 60s and people started making music with it and treating it like an instrument. Synthesizers ultimately were used to generate all the sounds you hear here and most of what is in modern electronic music.
The Synthwave 'sound', certainly in the earlier part of the scene, was reminiscent of retro 80s electronic music, the sort of themes you'd hear in dystopian 80s film scores and the sort of thing you'd find in early 90s computer-generated synth like on Amiga demo discs. It still has a bit of that.