Auto swell

I’m currently using the new Utility Gate FX to obtain an auto-swell on a clean guitar sound.
I set the threshold and attack, and leave Hold and Release at 0.
It works, basically, but being it a noise gate, it cuts the sound too early when playing long chords (e.g. in a jazz ballad).
Is that the only way to obtain that effect?
My ideal behaviour would be that the threshold was active only to detect the transient, then engage the ADSR filtering, and nothing more … (but I’m afraid at that point it couldn’t be called ‘Noise Gate’ anymore :blush:
Any idea or suggestion about that?