I grabbed Kwares Erupt program.
Tried to simulate Toba.
To get the amount of volcanic gunk to erupt that Toba did, you have to simulate an eruption lasting over one year.
Toba erupted its load in less than that.
I seem to recall Toba was a Caldera.. like the one sitting under Yellowstone... does Kwares Erupt even have the capacity to simulate a Caldera eruption?
you could also get 4 2liter soda bottles and put some menthos in them and watch , too...........(just being funny)