Changing from finite to continuous samples and vice versa?

Hello,
I have a problem which I'm trying to overcome: I have a measurement system consisting of an analog output and reading two analog inputs. I would like to run it continiously to monitor the current values (without saving the previous data), however, when I click something like a record button, I'd like to start a recording of a predefined period (like a finite samples measurement) and then restarting the monitoring without saving again.
Currently my measurement program is based on the examples "Continuous AO" and AI vis, and are made with continuous sample mode and while loops. How can I insert a record button?
I tried putting event handlers in the measurement loop, however it suspended the loop from running.
I attach a screenshot of my current measurement loop. (With the shift register I tried to read data, however I cannot get it out of the loop, until the loop is stopped)
Thank you in advance
Engage! using LV2012
Attachments:
question.png ‏81 KB

I have tried adopting something similar, however it doesn't work the way it should. (Or at least the way I think it should) Could you please help me ironing it out? I've seen some vis on the internet with queue-controlled (but only one-way) and tried adopting them.
The MainProgram vi is the app, with some settings (now limited to a signal file selection and channel settings). Then the data acquisition can be started by clicking the Start Acq button.
And here come my problems: first sometimes the queue starts, sometimes it doesn't (or at least it doesn't start the data acquisition). And the main point: I set the sample rate, yet it is acquired at a much-much slower rate (my signal has a period time of 4 seconds, yet it needs at least 20 seconds to get near finishing). And the strangest: sometimes, mostly after some time (about 1-2 min) it hangs and does nothing with the daq (yet labview seems responsive, just my program hangs somewhere).
So now only the controlled acquisition is in the problem and first I don't care about forwarding the data for analysis and saving. (That seems to be the smaller problem).
What am I doing wrong? Thanks for your help.
I attach all the files. (MainProgram is the app itself, MY.SIGNAL is the signal file I want to output.) I use a USB-6211 device. (at work a physical one, at home a simulated one).
Engage! using LV2012
Attachments:
queued_daq.zip ‏366 KB

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