I think this is an easy problem. The whistling sound is the turbocharger which is provided for heavy diesels. I think you have accidentally enabled it.
With your TV remote, press Mute, press the 5 button repeatedly until you hear just one beep then press Mute again to get back to normal operation.
Please email me at
sales@mylocosound.com if that does not do the trick.
Regards
Peter Lucas
MyLocoSound