Version 25.04.0 is available upstream. Please consider updating! It seems that version 25.04.0 is available upstream, while the latest version in the Gentoo tree is 24.12.3. You think this warning is false? Read more about it here.
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.