wavegain from multimedia:apps project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/multimedia:apps/openSUSE_Tumbleweed/multimedia:apps.repo zypper refresh zypper install wavegain
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/multimedia:apps/15.6/multimedia:apps.repo zypper refresh zypper install wavegain