Heyja,
just to let you know as well. I did another tutorial with the Analog Four tonight. Its about creating a powerful Subbass, enhancing the Lowend with the Filters:
Stuff like this might have been around already; im pretty sure actually 
But one of my followers at Youtube asked me about that and yet again - i could not resist his wish 
I hope this is of use for some of you as well 
All the best and - Good night, im tired as hell now