Another important definition of psychedelic music is the content, added by its creator. I mean, if a DJ, compositor or musical engineer had been ridden by various gods (sorry for the Gibsonish expression, couldn’t help it ) and remembers how the sounds were like at this time, then he/she’s tempted to make the music sound similarly.
For example, cannabis. Maybe it’s only for me, maybe for also other people and drugs, but ganja catches a sound you hear and repeats a piece of its end furiously in an increasing frequency, till it fades out behind your sight, and you find yourself you were gaping for a while, following it with your mind. Whenever I hear a sound effect in music like that, for example in drum n’ bass or In Dub then I know the author knows what he’s composing about.
Another good example are these spacial water dripping effects, (like these on Gamma Goblins or Shpongle Falls), these probably resemble a consciousness, expanded by DMT or acid, don’t know, but I suppose so.