u/Disastrous-Big-7549

Hey all! I recently bought an aftermarket unit to use Apple CarPlay on, and it works perfectly fine. Today I found an issue while navigating, however: If I’m playing music, it does not lower when the navigation voice starts speaking, making it (almost) impossible to hear it and having to rely on visuals. I found online that a fix is to try adjusting the volume when it starts speaking, though that doesn’t work because the volume control controls the whole unit. Is there anything I can do? Thank you!
Edit: The nav app’s volume is set to max (Apple Maps: Louder, Waze: full on volume slider).