Card sysdefault:0 'Audio'/'Apple T2 Audio' Mixer name : 'Apple T2 Audio' Components : '' Controls : 1 Simple ctrls : 0 Card sysdefault:1 'PCH'/'HDA Intel PCH at 0x8fa30000 irq 155' Mixer name : 'Intel Icelake HDMI' Components : 'HDA:8086280f,80860101,00100000' Controls : 28 Simple ctrls : 4 Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',1 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',2 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',3 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on]