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@HughB
New firmware is better but still way out for none walking activities.
With regards to threshold - I will post some charts I did that compare the filter outputs when walking. The old filter had more pronounced amploification and also tended to centre the output wave around zero better. The new filter can have a full since wave above the zero line. This is why I have now coded a PEAK detection method. To do that I store the last 3 consecutive filter readings (Left Middle, Right), If the middle one is greater than the left and right reading then a PEAK has been reached. This seems to be much more adapatable, self tuning and reliable. You can see my code in the github link above.
What did you think about using the simpler oxford filter ? I'm testing the firmware one and the oxford one at the moment. Looks like the oxford one is even better.