I bought a brand new 20S and upgraded to firmware 1.6. It seems that everything works OK apart from one thing. FM radio and intercom volume seems to be not independently adjustable. If I am listening to FM radio and the intercom starts communication, the volume of the FM radio isn't lowered.

I already tried the following:

Tried to change the value of intercom audio overlay sensivity without any effect.

I tried to adjust the volume of the FM with the jog dial to a low level, then switched off the FM radio. According to the manual, it should remember the volume of the FM. If then an intercom session is started, it starts at the volume of previous FM setting (too low). I have to turn up the volume to clearly hear the intercom. If I then break the intercom connection and later switch on the FM, it starts at the loud volume of the previous intercom session (too loud).

The opposite is true as well: I establish an intercom connection. Volume is adjusted to a higher level. Then after breaking connection, switching on FM, it starts at the high level.

It seems that FM Radio volume and Intercom volume are exactly the same. Is that the case? That makes the FM/intercom functionality pretty useless.