This is a granular request, but I think it would be good to allow the user to manage the audio output of the title for their specific setups. What i mean by this is i have notices on PC using 5.1 or 7.1 setup, all channels receive audio as expected, but the surround channels are at a lower amplitude (centre, sides and rears), they are very soft. This can be seen in both horizon and motorsport, and can be replicated by going to ones audio mixer on PC and reducing the front left and right channel volume to hear the surround channels (and that the surround channels are very soft).
If we have a slider to allow us to amplify these channels in the game, we would not have this issue (in my case I would have to reduce my front left and right channels by 80% to have a balanced audio experience which does not make sense as in other titles the audio will now be rear heavy as it is system wide).