Package: xfce4-mixer

"xfce4-mixer" package binaries on CentOS:

/usr/bin/xfce4-mixer

You may install this package on CentOS with yum install xfce4-mixer

"xfce4-mixer" package binaries on Debian:

/usr/bin/xfce4-mixer

You may install this package on Debian with apt-get install xfce4-mixer