multiple channel filtering

[pomplamoose]

hello, i have another problem here, just started learning filtering and decided to practice on the task im doing, so got this one question: i have two signals on the input channels from two pressure sensors which come with high noise. i tried splitting the signals, filtering them and then merging them again to send to waveform, but it somehow didnt work, and i thought whether there was a specific filter for multiple channels, i read that some FIR can split signals within itself and them merge them automatically, but i couldnt find one. any suggestions for the novice? thanks in advance 

p.s. by the way, managed to filter one of the signals split manually, and for some reason, the waveform displaying the pressure sensor data with noise stops working after apprx 3 sec, it kind of lags a bit and then goes blank black, if any suggestions on that, would much appreciate

p.p.s both waveform charts showing the initial data from the sensors go blank black after a while simultaneously 

[Markus_M]

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