How to have a synth come to a smoother stop?

It's just a simple bass slide you can do that with native FL plugins or with pitch bend if you are using 3rd party pluginshttps://youtu.be/lqj-bJjq6zE
 
I didn't listen to the examples because it seems the posters above me already have that covered, but based on what you wrote, it sounds like you just need to turn up the release on your amp envelope.
 
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