Dreamer,

Yes, the B4 simulator can scream too with the expression pedal. That I like a lot. In fact, one of the included presets is called "SCREAMING B4". It sets the tone wheels to an appropiate setting.

Also, at some sites the Hammond B3 settings of several players are available. There's even a site which tells you settings to make it 'talk' and it shows the settings to produce the vowels, but it is not a course, just a brief mention.

But that's too advanced for me.