Does anyone know what's possible and what sort of sounds can be
produced?

I know Susanna Borsch, Dan Laurin, Tom Bickley and others have used
live electronics in their concerts, but I can't find out what sort of
equipment they use. I presume it includes pitch shifters,
harmonisers, vocoders, guitar effects units etc.

Emma, could you please forward this to Ollie?

- Nick