In the interest of NAMM
Do you want a $64,000 turntable?
cause I know I do
Id hate to think what new needles on that thing costs.
Yeah and you can have 4 of thew 
Would love to hear it in action though!
Why does it need 4 tone arms?
So you can put qberts record on it and scratch 4 samples at the same time… or something…
Id like to see someone do a spinback withOUT knocking any of the tone arms lol
It says so in the article…
you have 4 tone arms at different weights with different needles on it to get better sound off of different styles of music. 
That doesnt sound nearly as exciting as my idea
I think your idea is pretty damn awesome. BUT, I don’t know how reliable I’d find that magnet to not fuck everything up
With? Without would be demanding more skill. 
But 4 needles, perhaps 4 times the bandwidth of 1 needle? Still funky how they’d get 4 needles synched. 
Edited
Much better!
Maybe you can use the different tone arms as cue points somehow, like a hardware cuepoint
You ever see the R.A.K.E. needle. Kind of the same concept only with 2 tracks. And they have to be locked tracks. Its fun to play with. Not sure how popular it ever got.