OK here's some tips on trance bassline.
You use reason right? Well the subtractor is good for basslines.
Why don't you try turning up the volume on your subtractor to like 100, then move the filter freq to 34 and then the filter resonace to 16 try that at a low ocatve. That should give you a good sound.
The classix trance basslines is just a 4th note on the off beat at around 135bpm. It sounds good cause the bass and the kick drum aren't going at the same time and it gives the kick the impression that it is more booming. But if you are gonna do a more complex bassline, try not to make it longer then 2 messures. Cause if it is like 5 messures long, it will get borring faster then if it is 2. It sounds weird but basslines don't need to change that much. Though it may be a good idea to have more then one bassline in your track, but anyway. If you make your pattern so that it is not in the same place as your bassdrum, it will sound good.
I.E.
1= kick 2= bass
1 : +---+---+---+---
2 : --++-+---++---+
I know it is a .... diagram, but bare with me, it is hard for me to give tips on basslines with out talking to sombody dractly.
Maybe sombody eles out there is better at this.