Comment 1 for bug 1214079

By the way, in order to use the a52 and a2dp simultaneously, I specify "a52" for Master and "pulse" for headphones, after connecting the headset and setting it as the default pulseaudio output using blueman and pavucontrol.

There's no other way to access the headset than indirectly through pulseaudio, which I think is an alsa problem (no functionality to identify or control bluetooth devices, even with bluez-alsa installed).