I had the same issue.
It seem piggy has choose the 3rd alsa audio channel
Piggy has seen audio 0 and audio 3 it has select the 3rd.
You need to understand the audio routing of alsa :
- which Alsa channel is 0 and 3 ;
- how to route audio to the correct channel on Linux ( modprobe Alsa )
My default audio channel on debian was my hdmi card i fix it greping around.
Johann