Hi Tilman
The following session in control_panel.xml works fine for me:
<session name="Flight address@hidden">
<program name="Data Link">
<arg flag="-d" constant="/dev/ttyUSB0"/>
</program>
<program name="Server"/>
<program name="GCS">
<arg flag="-layout" constant="left_col_reto.xml"/>
<arg flag="-speech"/>
<arg flag="-maps_no_http"/>
<arg flag="-zoom" constant="0.5"/>
<arg flag="-track_size" constant="200"/>
</program>
<program name="Real-time Plotter">
<arg flag="-c" constant="*:telemetry:ESTIMATOR:z"/>
<arg flag="-c" constant="*:telemetry:DESIRED:altitude"/>
<arg flag="-m" constant="200"/>
</program>
</session>
I don't see the reason why your "-speech" option should not work. Does
it work when you enter it manually in the Paparazzi center? I have
never used the "-b" option you are using, so I can't help you there.