Trance Bass parts

Ok, So I have a question about the bass parts for a trance track. In the video it shows that he has 3 bass tracks. Then he copies them and makes them faster so its a total of 6. My first question is are they the same note but just in a different pattern? Do you only put one bass in at a time? Or do you use all of them at the same time and layer them for a full sound?

Thanks.

I think there are only ever 3 going at any one time…

Ok and thats the “High, mid and low” bass correct? And are they the same note just different octaves? The same pattern?

they arnt the same pattern… they tend to get more busy as they go up in pitch… eg the sub sound is only 4 notes in the bar where the top one is 16 notes.