Hi Mike,
You have not stated what version of LabVIEW you have so I have modified your VI in LabVIEW 7.1 you will need LabVIEW 7.1 or later to open the attachments.
I have modified you original VI and kept the name the same "Wav_playback-1.vi" in THis I have removed the Tradiotional DAQ call, as you also had a DAQmx call, I have wired everything together so it should run. However I don't think this will work as you are using Tasks (which you have not provided) and then you setup timing and triggering again. All this is setup in the Task.
For the reason above, I have created "Wav_playback-_mod.vi" which has my original modifications as well as removing timing from you AO section, as this is in your task. In the AI line I have removed the Task and added the create Virtual channel call to setup the input as a Voltage input without using tasks as you need control of the sample timing VI, so seting this up as each step is better than using tasks.
Regards
JamesC
NIUK and Ireland