How Do You Get This Sound ...

[Big Ears]

Hi - I am new to playing synths and electronic keyboards.

I wanted to know if anyone knew how to get this sound. I have tried holding a key and sliding mod wheel but its not the same.

listen at the 8 seconds mark here:

and at the 7-second mark here:

I hear it a lot in 80s music.

Thanks in advance for your help

Big Ears...