Kwave is a sound editor by KDE.
With Kwave you can edit many sorts of wav-files including multi-channel files.
You are able to alter and play back each channel on its own. Kwave also
includes many plugins (most are still under development) to transform the
wave-file in several ways and presents a graphical view with a complete zoom-
and scroll capability.
There is no official package available for openSUSE Leap 15.4