@scott-seward No, I don't think it has a swing setting at the moment.

If you own the premium version you could load the Beatbox WAV into a separate VST instrument like the free Big Fish Audio Momentum or free Decomposer Sitala and play the beat with MIDI.

Both can slice the beat automatically and then you can create a MIDI groove with the MIDI editor and swing quantization. If you change the view to cell mode the MIDI editor shows a drum beat grid similar to Beatbox.