Does a Decay Envelope VST exist?

Hi everyone!

I just bought an SP404 MKII but it seems like there is no Decay option on the envelope.
I'm trying to think outside of the box and see if there's any VST I can use to regulate the decay of a sample after I de-pressed the pad. I still haven't got the SP404 in my hands, but I will soon. I've got samples that would end up too abruptly and I need to add some decay to them.

Thank you if you help!
Cheers!