I am now really confused.
Me too.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
I can tell you what I'm used to with the lecroy scopes:
Signal on e.g. channel one, channel one knob is lightning and trace was visible on the screen.
You are going to do a math function, choose the source to channel 1 and the function will be displayed on the screen too.
Now I only want to have this math trace on the screen, so I press the channel one knob, knob lightning is off, channel one trace on the screen is off too, math trace of channel one is still visible.
This is what I mean, it SEEMS that channel one is off because it´s not visible on the screen and knob, but still math trace will be displayed.
So there is trace display off feature but it do not work?
The FFT function is somekind of a "stand alone" feature.
You can choose to display it with the source, with the source in split screen or only the FFT, this is called "exclusive".