Playing two sound waves across two different sound cards simutaneously?

Hello all.
With the help from old board posts and the example VIs packaged with Labview 2009 SP1, I was able to get part of the way.
The goal is to simutaneously play two .wav files, to two different sound cards. So far:
1) I can play one wav file to either sound card
2) I can generate two sine waves of different tones, and push each out to the two cards seperately simutaneously.
But when I replace those two tones from #2 with .wav files, the wave files play alternately. So wav_1 plays to sound_card_1, THEN wav_2 plays to sound_card_2, not simutaneously.
Is it even possible to play 2 wav files simutaneously out to different cards?
I've included a VI of the attempt in #2 above. Disclaimer: my labview skills are minimal and this vi was very experimental so it's probably terrible form.
Solved!
Go to Solution.
Attachments:
sample_code.vi ‏23 KB

Tzoom84,
Since there is no way to buffer your sound output on the sound card and use hardware triggering you will be limited to software start timing. You could use semaphores as you said, or simply wire both of the Sound Output writes in parallel inside a single while loop. Since windows is nondeterministic the best you will likely achieve is the two outputs starting within tens of milliseconds of one another. The time between the two starting will be affected by all other processes running on your system and may take much longer.
Regards,
Sam K
Applications Engineer
National Instruments
www.ni.com/support

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