7000 warble

A clip has just been put on youtube which I found interesting.  The 7000 warble.
My machine when it does find a gold target actually yodels, like "yodel odel" both ways until the target is out of the ground.  Next time I'll video it so people can hear it.
So how are other 7000 owners finding target signal/sounds, I've never heard the high and low tones yet,  it screams when it is junk and lead/bullets is just an even tone both ways.

Thanks BigNuggs. If the ground was quiet, I think I'd get this target but if other ground noise around fair chance I would not. A lot of work I have to do to get my ears tuned in.