When I drive to work I usually have the following setup on my HTC One M8 (Android 4.4.3):
Car Home Ultra is set to autostart when I put the phone in the official car dock. When that starts it automatically enables bluetooth on the phone and connects to my Sony Ericsson MW600 bluetooth headset in my glove department connected to the AUX port there so I get audio to my car stereo.
I then start Subsonic and then Waze, that is Waze in the foreground to see route information and subsonic in the background. When I want to pause or skip song I just pull the notification area down and do that from there without having to switch to the app which is great.
I've set up Waze to only enable sounds for warnings (like traffic cams if I drive fast, accidents on the road, change of route etc.), not for turns etc. since I know my way to work
Before the 4.4 update of the app when Waze started to talk (like warning me when I drive to fast close to a traffic cam) it kind of lowered the music (I think) so I could hear the warning with the music playing in the background.
After the 4.4 update whenever Waze is about to tell me something instead of hearing the warning I see that the bluetooth sound is lowered to inaudible so I don't hear the waze talk. Then when I suppose that is finished it raises the volume again and starts playing the music where it left off. I see the bluetooth volume slider appear on the screen and lowering it when approaching a traffic cam fast and don't hear the warning. Then a few seconds later the bluetooth volume slider reappears and sets the volume back to maximum.
This is really annoying since I miss all the audio warnings. I suppose this is a bug in the "audio focus support" mentioned in the change log for 4.4, since I though it was supposed to make the route guidance/notification sounds easier to hear, not inaudible? Please put it back as it was or fix it so it works as announced. Or if you think I do something wrong on my side, please let me know what, because this has been working great for many years up until this weekend.
PS. I know there is a whole thread about it that is marked as resolved, but as far as I can see I didn't find any solution there and I still can't find a way to get the Subsonic app to use my external sd-card. In the 4.2/4.3.1 change logs of the app it says it has fixed issues writing to the sd card, but the "cache location" is still disabled in my settings and point to /mnt/sdcard/subsonic (which is on the internal phone memory) while my real sd-card is mounted as ext_sd. My phone is rooted and I have full control of the external sd card, why can't I change the location to use ext_sd instead?