Drumkits with Bass Lines

Dear Everyone, I’m a new user of this amazing pedal and i have been purchasing a lot of drum kits and songs . this drum set alone is already perfect but still it needed some bass so i would like to ask if theres anyone can help me how to get some bass line on my drum kits i would definitely appreciate it.

right now i downloaded
vintage ludwig
standard pro
world percussion drum set

Thanks in advance.

Best Regards,
Francis Guitarist