If the sound card is USB, it is possible to record two channels (also known as Stereo) with Gingerblue 6.0.1.
Here’s an example of Stereo recording on Hewlett Packard portable running Gingerblue 6.0.1 on Fedora Core 36 with the Focusrite Scarlett 2i2 USB external sound card:
This autumn I am taking a course in audio engineering (Location recording at the Norwegian Academy of Music) and I have released Gingerblue 6.0.1 on https://download.gnome.org/sources/gingerblue/6.0/gingerblue-6.0.1.tar.xz and https://gitlab.gnome.org/ole/gingerblue.git with Ogg Vorbis encoding and this course is about Stereo recording.
To write my own Stereo audio recording software for this engineering course is a fun experience.
See https://blogs.gnome.org/oleaamot/2022/05/28/gingerblue-6-0-1-with-immediate-ogg-vorbis-audio-encoding/ for details about Immediate Ogg Vorbis Audio encoding in Gingerblue 6.0.1 and https://wiki.gnome.org/Apps/Gingerblue for more information on Gingerblue.