HI Randy!
When I select bike pump as a granulator source, It loads the default sinewave.
Also not sure about this but the rate in granulator is at zero, changing samples doesn't seem to work. You can see the sample in the wave display change but the sound remains the same.
Just dug in the manual and at a rate of 0 for the granulaotr, no new grains are formed so changing samples shouldn't change the sound I guess.