Correct returnAudioTarget for direct playback on the Raspberry
I am currently trying to build a video doorbell using a Raspberry Pi 2 Zero for which I need two-way audio. For this, I want to playback the return audio directly on the Pi running Homebridge via a USB speaker that is connected to it. What would be the correct ffmpeg parameters for returnAudioTarget to do so? 

The audio device to play the return audio lists under _aplay -l_ as follows:

`Karte 2: UACDemoV10 [UACDemoV1.0], Gerät 0: USB Audio [USB Audio]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0`

I was thinking of 

`-f alsa "hw:2,0"`

or

`-f pulse "default"`

Am I thinking correctly?