[maxmsp] Goa trance

Making something sound "psychedelic" is difficult unless you have a 
clear idea in your head of what that is, specifically.   I would imagine 
that ways of slowly changing and evolving the sound over time would be a 
good start.  Another thing to imagine is ways of changing multiple 
aspects of the sound simultaneously, such as oscillator frequency, 
modulation amount, filter frequency, etc.  You will want to choose some 
basic synthesis technique to start with (FM is popular) and go from there.

Good luck,
Andrew B.