null
    Discard all samples (playback) or generate zero samples (capture)
pulse
    PulseAudio Sound Server
default:CARD=Solo1
    ESS ES1938 (Solo-1), ESS Solo-1
    Default Audio Device
sysdefault:CARD=Solo1
    ESS ES1938 (Solo-1), ESS Solo-1
    Default Audio Device
default:CARD=Loopback
    Loopback, Loopback PCM
    Default Audio Device
sysdefault:CARD=Loopback
    Loopback, Loopback PCM
    Default Audio Device