Unknown PCM cards.pcm.rear (pyaudio)
Refused connections are removed when removing the following bluetooth package (if you really want to) sudo apt-get remove bluez-alsa
Unknown PCM cards are removed by commenting out relevant lines in /usr/share/alsa/alsa.conf.
The others I don't know about, but you could start looking here: PyAudio working, but spits out error messages each time.