Hi, I want to have this indicator on wealth-lab (the band stop filter version of SWAK), but I dont know how its calculated, anyone knows ?

Here is some information I found:

This function emulates the effects of a Band-Stop Filter against a Price for a specified Period and Delta using SWAK.

Parameters
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Price The price of the security for each given day.
Period The cycle length to stop with the filter.
Delta The percentage of the period included in the stopband.

If it's the SWiss Army Knife indicator - SWAK

Thanks Cone, yea if you specify 'BS' as indicator type you have the Band-Stop version, I didn't noted that, thanks again