Blend container release after track no longer active

Question

Hello,

I've been struggling with this issue for a while:

I need the audio inside a blend container to play until the end after the RTPC controlling it steps out of its range. If I have an RTPC that very quickly ranges from 0 to 1 and again to 0, I want a sound to be triggered when the value is 1 and be played until the end.

This seems like a very simple feature that I can't find an answer to. One other third-party software whose name starts with an 'F' (:P) solves this with a checkbox.

Thank you in advance.