How to get the bass slide like these 3 in fl studio 11?

[ice909]

I've been wondering on how to slide the bass smoothly in Fl studio. Every time I attempt to do it, it sounds too steppy or simply just not smooth enough. Is it portamento? Do I glide my fingers across the board? What do I do exactly. Thanks.

https://www.youtube.com/watch?v=IZa-z9S_6hQ

@ 0:01

https://www.youtube.com/watch?v=VDwZJaJFrbg

@ 0:05

https://www.youtube.com/watch?v=jeL650mIews

@ 0:17

[neoncortex]

Found a tut for you:
https://www.youtube.com/watch?v=jwygq0uqXxw

[kokotte]

check your fl midi ppq resolution, in the option, with 96, no problem when harmor slide
cheers