Soundfont Notes with "endless" release?


I’m currenty trying to use the Zynthian as a sample player for the live show of my band. There are some sound effects that I just want to trigger so that they play from beginning to end. Some of them are more than 30 seconds long. Does somebody know if this is possible? I’m creating the soundfont with the program “Polyphone”.
I tried to set the release really high, to something like 60 seconds, but it still fades out pretty much.