Comment 27 for bug 1620636

@ksoeteman

I'm afraid you can't use HiFi playback (A2DP) and the microphone at the same time on any playtform, since it's a general Bluetooth limitation:

Profile limitation – Bluetooth headsets are currently limited to using one profile at a time. Those who read the Bluetooth Profiles section above carefully will note that this presents a problem as the A2DP profile supports stereo audio, but not microphone functionality, and the HSP and HFP profiles support mics but are limited to low-quality mono transmission. This renders modern Bluetooth headsets unusable for gaming that also requires voice chat, for example, as the audio will come through in low-quality mono rather than stereo. Likewise, while using Skype or any other software that requires continuous headset functionality, any music that is playing simultaneously will stream through headset profile in low-quality mono and sound terrible as a result.

From: http://theheadphonelist.com/wireless-fidelity-making-sense-bluetooth-headphone-technology/