Two output tasks on one device

I would like to learn the best way to configure two output tasks on one device. Both tasks employ the same channels. Task 1 outputs a 2D array (raster pattern on some channels and DC on others) for which the array values and array timing may change during the rastering. Task 2 outputs only DC values in a 1D array: one value for each channel. There is a Boolean that turns the rastering on and off.
Should I have two separate tasks or one task where the DAQmx Timing and DAQmx Write change according to the raster on/off switch? Do the tasks need to Start each time an array value is changed? I've come close to making it work both ways and the major problem seems to be a "resources are unavailable" error when I want to stop everything and send 0 to all the outputs.
Thanks, Peg

Dear Paul,
Thanks for your response. I have managed to produce a vi that seems to work with just one task. When changing back and forth from rastering to non-rastering, the task is stopped and started, but never cleared until the vi ends. What I don't understand is why new values are output even though I don't call Start Task each time a value is changed. I'm happy it works but I'm nervous that I don't know why. I have attached it in case you (or anyone) has the patience to take a look.
Thanks,
Peg
Attachments:
DAQmxAO Write DC& Raster switch.vi ‏280 KB

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