No, the settings do not override the camera shutter.
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Howdy. Just confirming, in Multi mode the flash frequency (Hz) and number of flashes are independent of the camera shutter speed. (changing the shutter speed does not change the settng on the flash)
Why?
I'd say this comes down to how you might use the Multi mode. I'm not sure if you've shot pics in this mode - lots of stuff happens faster than you'd think, and, too many flashes on one exposure can muddle the image, (and often you'll be trying to control and ambient exposure too).
For example: photograph someone skipping/jumping rope in daylight.
1. The ambient exposures (for example) is 1/30 sec @f4. (reduce the exposure a bit so the effect of the flash will be visible) Actual exposure 1/30 @f5.6
2. Set the flash output power. Let's say 1/64 power looks right.
3. Set the flash frequency. 30hz means only one flash will be captured. 180hz means 6 flashes captured.
4. Try out varying the number of flashes. Maybe 6 flashes mushes too many images together. Maybe 2 falshes looks like a mistake. 4 flashes looks good.
5. Go for the shot. The flash might keep up with the camera for 2 or 3 frame bursts; Bzzt, Bzzt.... Bzzt,Bzzt,Bzzt.... Bzzt.....
Now if you really want to do your head in... Mutli flashes at the same power can look a bit boring. What about a second flash with different settings? A third? Coloured gels?
Cheers
Wollom