Help with data adquisition vi

Good day.
I have this vi in which I read two signals from a DAQ device and visualize them on screen and write them to a file. However, I need to modify it a bit and I don't know how. Currently, the signals are stored automatically after the vi starts running. I need to change that so the recording of the data only starts after a button is pressed (I want to first visualize the signal and them store it if I need it.) I tried using the Relay Express vi, but it made the program run slower meaning in a loss of data (high scan backlog). So, any ideas with this?
Second, I need to remove the DC from my signal dynamically. I really don't care much for the scale of the graph charts that visualize the signal, but sometimes the signal moves away from the window of the chart and I can't see it. The autoscale y option is not good for me (I need to keep a constant window amplitude). Any help with this?
Thanks.
Attachments:
RegistroParaVideo2010v2.vi ‏355 KB

Ha, I'm certainly no genius either but good coding style is really important. Especially when you want to go back and modify or upgrade your code.
Traditional DAQ is perfectly fine, you code is working so there's no real need to worry about DAQmx.
See the pic for an example of subtracting an offset from your waveform.
Do you understand what Dennis said? You need to put a case structure around the 'Write to File.vi' and then wire your button to it. That way you're collecting data all the time but it only gets written to file while the button is TRUE (assuming you put the Write VI in the True case).
Using LabVIEW: 7.1.1, 8.5.1 & 2013
Attachments:
SubOffset.JPG ‏34 KB

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