Binary package “pavumeter” in ubuntu disco

PulseAudio Volume Meter

 PulseAudio, previously known as Polypaudio, is a sound server for POSIX and
 WIN32 systems. It is a drop in replacement for the ESD sound server with
 much better latency, mixing/re-sampling quality and overall architecture.
 .
 A simple volume meter for the PulseAudio sound server.