Well I've worked that out now, am managing to get the natures I want every time. But still can't hit the exact frame I want have been 1 or 2 frames out every time (so frustrating).
I'm aiming for 6686 and the last 3 times I've hit 6685, 6687 and 6690.
I suppose it's just going to be constant trial and error due to the human element of me pushing the button.
Don't believe it!!! Been getting the right nature every time, but missing the frame. Finally hit the frame after a whole evening of trying and guess what . . . wrong nature Timer trolled