Do you trigger fills a bar in advance, or do you often do the 'pick-up' type where you wait until the two or the three?

I am still confused about the reported timing problems on a few styles. Does this happen because of a large number of Tone changes and parameter changes glitch the start of the fill if they are poorly matched? Do PA arrangers have glitch-less patch changes, or does the sound cutoff if you change from one tone to another on the same channel? I know my Triton cuts off....

Or is it because of the wrong mode being employed? (don't Korg's have a mode that jumps to beat 1 of a fill the second you hit the fill, regardless of where you are in the bar when you hit it? handy for Middle easter non regular time signatures...). That might cause the unwary to assume it's a fault with the arranger, when it might simply be a fault in the style.

You would have thought, by now, that someone would have tracked the issue down... mind you with all the owners (or most, at least) so hell-bent on denying the issue even exists, it must be tough to make yourself try to track down a problem you are reticent to even acknowledge...