So it seems that Realdrums isn't available on Playbook, but I think I found a workaround.
I'm new, so let me know if you know this already. Or if it's useful.
Install and open the Realdrums demo from big beard.
Remove all the other machines from the sequencer and clear the tracks if you like.
Save just the beatbox portion still set on rootreggae as a song. Name the song realdrums or something.
To use, just open that song and you got all the drum sounds. Just build off of that.
Nice drums.
RealDrums on Playbook