The topic seems to have sparked some interest.
Yes, some sort of octave shifting pedal had to be involved.
Yes, I googled it as well and came up with a similar list, however a comprehensive description of what it was being used, it was white and small, only kidding.
I was not very close and seemed to have a touch pad, to turn on/off and a single dial, not multiple dials. Not been able to track down the actual pedal on the internet yet.
I have looked at the Cher video you identified, never realised before the trickery that goes on.
They do say you learn something every day.
As you say not really any good for us, I think you have to have a good and controlled singing voice to make use of it.
As I said I have lived a sheltered life when it comes to modern day musical effects.
I think you are right in that you need to be a very good singer to make it work, as I can imagine it is a bit disconcerting to be singing and what you hear is quite different to your normal voice.
Will have to track downs some of Ron’s songs.
See my earlier comment back to Rob, don’t think what i saw was among these
I do remember Jeffs Billy Idol cover, but the technicalities of what he was doing were way beyond my understanding.
You mention Cher, it is like photos these days you can’t believe what you see anymore and the same with singing.
I would say the pedal was doing more than one octave change, given that he was probably baritone or tenor then to go up to soprano is quite a few octaves.
He did Eurythmics Sweet Dreams Are Made of This, a song I know very well and if I shut my eyes, I would swear it was Annie Lennox singing.
The man himself with TC Helicon.
Does it make small changes or is capable of significant changes in octaves and do you find it a little strange hearing yourself back although I do know that what you hear within yourself is not what other people hear.
Visual effects definitely matter!!!