Changing 'BOW DIRECTION' in Hyperion Strings Elements..?

[Victor Kennedy]

Can anyone explain how to use the 'bow direction' change? It says in the manual it works with the sustain pedal engaged, but that didn't seem to work for me. All it does is Sustain the notes being played. To get realistic sounding string parts changing the direction of the bow is important, especially for shorter, repetitive phrases.