JSZ
2
If you’re not getting anything through my first guess would be that the MIDI cable is faulty, can you test it on another device?
The second thing that comes to mind though I don’t think it’s likely, is that maybe the Volca’s MIDI RX ShortMessage and MIDI Clock src settings are not right. They should be “on” and “auto” respectively, see the Volca manual on how to check these.
edit: One more thing. I don’t have the Sample so am not sure but did you try all notes on all octaves? Maybe there’s just one note that triggers samples, since there is no way to chromatically play them?