No, it will explain the different feelings you get with Goa trance.
What? No, I'm pretty sure it would better if you added the music in software rather than sending it out of a speaker and back into a mic. The latter can only reduce its quality.
12/8 means that each bar has four main beats, but each beat is divided into three smaller beats of equal length.
http://www.youtube.com/watch?v=kYWbpwz6un0
http://www.youtube.com/watch?v=quApkkNG6_g
http://www.youtube.com/watch?v=glC9DWNKIQc&t=4m14s <= Start at 4m14s
http://www.youtube.com/watch?v=9t0f0hGPBRs&t=3m25s <= Start at 3m27s
I'm sure there are many others but those are the only ones that spring to mind right now.
Are you just asking for tracks with 12/8 a time signature, or is there something more specific about the three tracks in your OP? Because if it's the former then there are loads.