Direct Output/Send only in Tuner mode for external Rack Tuner

Hi!
I would like to use a bigger Rack Tuner for better visibility on Stage.

The Problem is:
When connected to the Direct Out, the Tuner gets a Signal while playing and displays random stuff all the time.

So an Option to enable the Direct Out only when in Tuner Mode would be handy... or are there any other options for that?

Thanks!
Toby