How to generate a sound (tone) without clicking noise, and how to select left or right speaker

Hi All,
I am trying to write write a VI that generates a pure tone of specific frequency and volume, then sends that tone to one speaker or the other (Left or right) for use in teaching students about audiology (those hearing tests you may have taken where you hear a noise in one ear or the other). I have created a rather primitive VI to accomplish this, but I am plagued by a few issues:
1) At some frequencies but not all, the VI generates a clicking sound at the start and stop of the tone (I believe this is related to repeating configuration and call of the hardware, but I don't know how to set this up ahead of time and avoid it - and why doesn't it create the clicking sound at all frequencies?).
2) At some frequencies (14000Hz and higher), I don't hear the tone at all on my computer speakers (I still hear the click before and after, but I don't hear the tone. I know what you might be thinking, but no, this is not a hearing deficit on my part :-)
3) I would like to be able to direct the tone selectively to the left speaker or right speaker, but right now my VI only allows me to pick the "number of channels" (for which I presume "2 channels" means both left and right), but I don't know how to selectively pick only one channel or the other.
Thank you for any helpful suggestions you can offer,
Eric
Solved!
Go to Solution.
Attachments:
Audiograph_Erics version.vi ‏65 KB

Eric,
Yes, I intended to include an image. Sorry. Here it is.
Thanks for the subVI. With it I hear clicks most of the time except on some of the low amplitude outputs. Interestingly, at frequencies above 10 kHz where my hearing is poor, when I do hear something it is a non-pure sound with a dominant frequency lower than the generated frequency. I am not sure whether it is something in the sound system on my computer or in my ear/brain/mind acoustic analysis system. Here is what I get with my bad ears.
This is what the graph on Generate Sound-subVI shows when I hear the lower pitched sounds. Although the frequency is low enough that it is not aliased, I suspect that I am hearing the envelope rather than the underlying carrier.
I have not played with the windowing yet to see if that reduces the clicks. They could be generated by the Sound Write turning sound on and off.
Lynn

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