Disable all sounds through Highway Radar, alert only through Detector?

I have a R4 and an Atoto portable Android head unit I use for HWR. I normally have HWR and Maps split screen with music playing in the background. Is there a way to still show all the crowd sourced alerts on the HWR map but never make sounds through the app? I would like the sounds to only come out of my R4 and never mute or turn down my music. I live in an area with a lot of congested cities and it is helpful to see the alerts but I will never hear my music even if i set it to only...

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