Consider the introduction in this article to goatrance, at the very bottom of the website after all kind of psytrance subgenres.
Roland TB-303? Not mentioned. The archetype synthesizer of acid and goa trance.
Acid? Not mentioned. A genre related and inspirational to goa trance. Same with trance, and techno.
SH-101? Not mentioned. Frequently used synthesizer in trance, including goa.
4-4-4-4-1 bass-line? Not mentioned. Its the bass-line which is typically found in goa trance. Some tracks by Miranda even have a slightly different bass tone on every bass hit which creates a kind of 3D effect in the bass (it feels like salsa to me).
Etnica? Not mentioned. Huge name (with sub projects like Crop Circles and Pleiadians) in the 90s.
For me, a band like Juno Reactor is much more according to the psychedelic values than the conventional psytrance.
Also, goa trance wasn't formed in Goa in the 80s. It was the very end of the 80s, but more the early 90s (91-93). It was normal to combine all kind of genres back then (trance, techno, house, etc). Consider, for example, the legendary Paul Oakenfold - Goa Mix from 1994. Or this very mix which combines different genres in one  (though it includes acid, not goa trance).
Almost every track on it is less then 10 years old.
The concept of "acid" appeared in Chicago.
It's fascinating how goa trance came about. At first they were just strumming guitars out there and then came the drugs and the very early electronic music from labels like Harthouse and Eye Q ... those were the roots of this movement.