It seems inconsistent and unintuitive at the moment where you must set your preheat temperature locally on the Control Panel, but if you then start the preheat using the PRS button, you cannot Playback!
This does not make sense. I suggest that:
1/ You should be able to set preheat temperature on RoastTime and then start preheat on RT too.
2/ You should be able to set preheat temperature on the Control Panel and then start preheat on the CP too.
3/ Playback of a recipe should include info for preheat temperature, so all you need do is start Playback and charge Bullet with beans when you are told to by the voice command.