How to hear sounds from line-in jack? (fwd)

[Linux for blind general discussion]

---------- Forwarded message ----------
Date: Wed, 23 Nov 2022 21:36:53 +0800 (CST)
From: 高生旺 <cosc...@gmail.com>
To: sl...@freelists.org
Subject: How to hear sounds from line-in jack?

Sounds from line-in can be recored, but how to hear them in time?
Which console command can be used for this purpose?
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