Hello,
I have installed a Bluetooth radio in my car. With the Xperia M4 Aqua Dual, A2DP works perfectly. Calls work too, but depending on the call itself, are sometimes not loud enough, even when I use both the volume rocker on the phone and the volume regulator on the radio.
I guess it;s because the call is not very loud. While in a usual phone-to-ear setup this gets compensated when I raise volume to max, with Bluetooth that is not enough.
If it was an AUX connection I could put an amp into it. With Bluetooth a boost should be achievable by software. But I could not find the software... Is there a way I can get a volume boost for BT calls?
