How can I access Eighty Eight's longer release sounds?

I see no difference when I adjust Eighty Eight's (v2.5) Release or Pedal controls, and I'm trying to get a more dreamy, ethereal long release piano sound!? I've tried several different piano presets, including those marked as "With Release Samples", but I see no effect at all to any actual release sound!?

I should add, at the moment I'm using a laptop, so I'm not playing through a controller, but either playing through an on-screen mini-keyboard or playing back MIDI info from my DAW, but I don't see why I can't access the longer releases, regardless. Thanks!
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