Remove unused channel enums
Swap delta and step, remove double semicolons
Add a boolean to specify if a device is headphones
Set headphones when pulse reports using the headphones port
Update a comment
Avoid using ALCdevice_Lock and ALCdevice_Unlock unnecessarily
Use a macro to reduce code duplication
Rename step to steps
Move the voice's last position and gain out of the Hrtf container
Make CalcHrtfDelta more generic
Trace PulseAudio's active port