Para openSUSE Leap 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Extra/openSUSE_Leap_15.6/KDE:Extra.repo
zypper refresh
zypper install soundkonverter
Para openSUSE Leap 15.5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Extra/openSUSE_Leap_15.5/KDE:Extra.repo
zypper refresh
zypper install soundkonverter
Para KDE Applications openSUSE Leap 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Extra/KDE_Applications_openSUSE_Leap_15.6/KDE:Extra.repo
zypper refresh
zypper install soundkonverter
Para KDE Applications openSUSE Leap 15.5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Extra/KDE_Applications_openSUSE_Leap_15.5/KDE:Extra.repo
zypper refresh
zypper install soundkonverter