Granular Synthesis - Not working

You need a few more nodes, and a little more setup. Granular Audio Synthesis is also a tool for slicing up an audio chunk and using those pieces in different ways. If you just want to play a sound, you can use the “Play Sound” node, or “Spawn Sound” node. Play sound will fire and forget. Spawn sound lets you save the played sound so it doesn’t have to load every time.

As for the Granular Synth, there’s this: