When the jack is stopped
When the jack is started
List of PLAYBACK Hardware Devices
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aplay -l
------------
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: ALC283 Analog [ALC283 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
1. But, I do not know how many channels are on my sound card. How to know the number of my soundcard channels?
2. Although I do not know, I keep trying the tutorial. I got to the stage of typing
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jackd -d alsa --period 32 --device hpfix
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bash: jackd: command not found
Thank you