That is fair enough – if the effect of this device can be accurately identified without the listener knowing if it is on or off then we have ruled out any potential placebo effect entirely to my satisfaction. As I say I haven't read the whole thread (I'll do so later) so I don't know if this is the case or not. I'm certainly not accusing anyone of anything. I'm far more interested to know what the device is actually doing or emitting.

Tony.