Whistling sound when connected to aux cable

When I connect ipod nano to AUX port on my stereo I get a whistling feedback sound along with the music. But when connecting another ipod its fine. Any suggestions??

> The projector speakers are working because if I connect via the VGA output I do get sound from the projector.
There must be something wrong with projector settings.
Fact is that HDMI provide digital sound. VGA provides only analogue signal.
I dont think there is a problem with the notebook since the sound appears properly via speakers and also its working if an TV is connected to the notebooks HDMI port.
By the way:
> When plugged into the lecturn via HDMI, I can see the lecturn in the "Playback devices" window. It comes up as "Extron D" which is the name of the System installed. It is enabled and set to default ( green tick)
In the Playback tab check this projector, click right and choose Properties.
Now the second tab Level should contain the option to change the volume level.
Its worth a check.

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