Studio Spot 575 CMY dmx questions

I have never used Studio Spot 575 CMY's before.

I am loading a bunch of profiles and getting everything ready in lightjockey for a show Friday night and I am confused about a few things regarding DMX protocols and the functions that go along with them.

Question #1 - What exactly does channel #5 'CMY Color Function' do?
Can I achieve a smooth, scrolling rainbow effect at different
speeds with this channel?

Question #2 - For channel #20 - My shutter control channel, the highest
dmx output value I am getting from lightjockey is 63 which
looks like the cutoff point for 'Periodic Strobe'....I'm assuming
that periodic strobe adjusts the flash rate? And if so how
come even when I click on 'Shutter Open' in lightjockey I am
still only getting 63 as my highest output for this channel?

Thanks
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