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I have created a sub-vi which un-pack data comnig from an embedded board with 8 channels and puts on its output the results. Now I'd like to implement an addictional feature which regards the filtering of this data through a low and high pass. So I created another sub-vi that integrate these kind of filters with inputs to set their configuration. When I use the filtering sub-vi on only one channel all seems to work well, but as soon as I add another one on another channel it doesn't work: the output signals are not filtered; there some changes in their trends but it's a indefinite behavior, not a low/high pass processing. It seems thet the presence of one filtering sub-vi intereferes with the other. I tryed to understand the problem but actually I'm in a dead end. Can anyone give me any suggestion or maybe a solution? filtering.vi unpack.vi