Play input data in serial connection in speakers ?

Hi.
I want to play input data with system speakers. Data receive from Serial Port and I want to play it realtime. my data frequency rabge is between 10 to 500 and it;s amplitude is up to 1. I use this Subvi that I right it for put in final Vi. 
Sampling frequency is 2000. 
anyway, I put this subvi in my final code, but It doesn/' work !!
anybody has idea ?
Thanks.

I send my final desin which play input signal from VISA read function. as you can see, in program this VI doesn't work !!
I use notifier for play a specified song when input signal cross over 3.1 , it worked correct when I don't use first post VI, and when I put first post VI into above VI, LV show an error.

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    Attachments:
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