How can I get the soundcard to create event markers on voltage acquisition

Hello,
I'm new to Labview and I'm required to create a program that can acquire a voltage.. sounds simple.. the difficult part is that it needs to be able to create event markers on the data to indicate that a sound has occurred.
If I could somehow route the audio input to the trigger channel of my NI DAQcard6024E and set the threshold level it would work, but I can't find a way to do this.
To put it in a real-life scenario... what is happening is that I'm acquiring EEG (brainwave) voltages whilst presenting a series of auditory 'clicks'. We want to examine the changes in EEG that occur in response to these clicks. So I need to have some way of establishing exactly when the sounds were presented on the EEG data.
Hope somebody can help At the moment my VI can acquire voltage data continuously and write the files to excel, but I can't work out how to create event markers for when the stimulus occurred.
Thanks
Shane

I still think it should be possible to make a breakout cable. But I guess the person responsible for the Lab is not a technical person. Or he/she is more concerned about the equipment than the student projects. That is quite common among such personal.
I am also reading you are using a sound card for acquiring EEG. That is a very big NO-NO. This because sound cards are AC coupled. And this will limit the lower bandwidth to about 10Hz. So signals below about 10Hz is filtered out. EEG require a bandwidth from about 0.5Hz to 100Hz.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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