I highlighted that already in the original thread when the Brick
manuals became available:
https://groups.google.com/group/rec....8775b7bdd8ba1b

It might have to do with the system architecture, where the brick does
the calculations, but the display needs to take care of the
presentation of the data to the user, visual as well as audio.

On the other hand, the Garrecht Brick TRX-1500 does have an audio
output (and an additional serial interface) in the D-Sub15HD
connector.
http://garrecht.com/index.php/en/ads-b/trx-1500.

It is indeed a bummer that the PowerFlarm brick does not have this
feature.
As Eric said, most newer radios have great features to input audio
from other sources (and mix/switch it properly)

Now, I still have some hope:
In the current published PowerFlarm Brick documentation, on the DB9
connector, pins 1, 4 and 6 have not been described.
I am keeping my fingers crossed.
Hopefully someone from the Flarm team can shed a light.

3U