Caustic Song file (optional):
Disclaimer: this is for more advanced users as you will need to understand how to use the modulars input modules and how to route signals through filters and other machines.
With all of the research I have done, articles, podcasts etc...about sound design and how to make things sound thick and loud the thing that is a constant is layering. You will need to stack sounds on top of each other to get that awesome fat sound you desire.
What many top producers do is layer a few synths with the same preset and tweak one slightly from the other changing the timbre and giving you a chord like effect. The problem comes when you try and change things too much as it causes phasing between the sounds and will make things sound worse.
The next step after you get your sound the way you want it is to resample it. To do this you simply export your loop and reload it back into a sampler. Caustic doesn't have a sampler but it does have the pcmsynth. The problem with this is the fact that the pcmsynth plays back in mono which will make your nice fat layered sound sound subpar again.
So the reason for this tip is in preparation for stereo support in the pcmsynth. It is a good idea to separate sound design from the writing process as you can simply go to your library of your own sounds for inspiration while writing a track. It really does make things easier as you aren't fiddling with filters and effects while trying to flesh out a whole track. So having a custom library of your own sounds that you can use in the updated pcmsynth will be really nice.
Included is a caustic file that shows how I achieved a really nice super saw lead. This is just one of the many awesome things you can do with layering machines and signal routing in Caustic.