(Edited original post)Update: 9 inch HF coil, reactivity 1 for depth, sens 90, desc -6.4, running 14.4 kHz. .
I'm not tech savvy and will probably never be, so help me out with this as it might be so simple that everyone gets it except me.
So I'm getting the :reactivity 1 for depth
:sens 90
:running 14.4 kHz
But here's the

Is this a typo -6.4 or a negative 6.4 and if it is how does one obtain a negative setting as I have tried and it stops at 0 ?