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I make Goa/Psy (my site with over 20 tracks for download: http://www.cybernetika.de ).
First of all, I have to distinguish between goa and psytrance. Goa is the more melodic, arabic type whereas Psy is more rythm-driven, but of course contradictions are fluent.
anyway, like already said, Psy consists of a not so deep kick... You can find some very good kickdrum samples online, take this one for example: http://www.cybernetika.de/psy_kick.wav ...
The bassline can be made very well with Vanguard for Example, but I found Audiorealism Bassline to be the most effective weapon especially for Full-On Type Basslines. Use very short notes and apply a compressor on the bass and it will sound quite hard. Usual layering in Psy is KBBBKBBBKBBBKBBB (with k being kick and b being bass, hehe)... Make sure your bass fills up the sub frequency spectrum (70-100kbps) so that your tune sounds richer, fuller and warmer. Goa in general has a quite different bass, I just use a simple off-beat bass (with less compression and volume) for Goa trance. There are probably hundreds of people knowing better about this than me on isratrance.
Concerning the percussion, the basic percussion follows the standard rules of Trance. Open Hihat in the Off-Beat, Snare every 2nd and 4th bar, eventually a driving closed hihat every 1/16th. You should now add another percussive element since these sounds alone aren't anything special... especially most Psy is heavily focused on groove and rythms with less melodies and harmonies. There are basically no rules for trippy synths. If you like them, add them. Some LFO action on them is quite nice too, synths accurately morphing into each other are actually the most challenging tasks, even for the elite of Psy. I'd suggest you create your FX-like Synths with Linplug Albino, I really love this synth for its endless possibilities of creating weird noises and shaping them ... Then arrange them in a groovy way. Finding out what groovy is is easy and difficult at once: everything that makes you bob your feet, or bang your head, or whatever ... read something about rythmics in music theory if youre not sure about this. Effects like Reverb, Delay, Phaser, Flanger, Chorus can help a lot, just experiment with all the FX you got to make your sound richer.
When playing with FX it may also be useful to you following the "question-answer" scheme. That means you got one sound being the question and some time afterwards another sound responds: the answer 
The last thing I'll describe here are the melodies and the layering used in Goa. Goa uses oriental and arabic melodies quite a lot. Mostly it is in hungarian minor or phrygian key scales but you can also do it in a regular minor scale. Describing a goa melody is not quite easy but its most likely a very simple repetitive pattern with fast note progression (compared to melodic trance with slow, but clearer note progressions). Essential for Goa is LFO as well, synths fading in and out of cutoff all the way provide the trippy feeling. You can (very very basically) say Goa consists of 3 melody layers. One sub-bass (very deep, more sensible than audible), a trippy deep synth, and a higher melody synth. That's just to help you understand the ranges of certain instruments, not a recipe on how to layer a goa track 
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