How do different sound cards dynamically use different configurations?

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Hi guys,

On a special PC, it is required to start the pulseaudio daemon
with some special parameters in the file /etc/pulse/daemon.conf,
as follows:

default-sample-rate = 48000
default-fragments = 2
default-fragment-size-msec = 20

When plugging in a USB headset with a separate sound card to this special PC,
I found that there was a noise in the playback audio. After investigation,
the sound card of the USB headset needs to use the following default parameters.

default-sample-rate = 44100
default-fragments = 4
default-fragment-size-msec = 25

So, how to enable the parameters required by the sound card
of the USB headset when using it.


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