USB-6259 Labview 2013: high rate Analog input sync with analog output

Hi, 

 I'd like to send two analog waveforms at 1 kHz and acquire an analog signal at 1 MHz, possibly acquiring 1000 samples immediately after each waveforms' update.

I'd need to write the acquired signals into an array strictly preserving their order then.

If possible, I'd like to have the VI execution lasting for  the time the waveforms need to be written (e.g. 4 s with 4000 samples at 1 kHz).

How can I do that ?

Cheers

Filippo