VideoLAN in 29 of December announcement the new beta version of new VLC 1.2
The error of this version is the volume. When you change the volume in vlc it is not instant as the previous version of vlc. It takes about 1 second for the volume to change.
To solve the problem is to change the output module.
To do this you must go to Tools->Preferences->Audio
And in the list of Output module you select: Win32 waveOUT extension output if you’re using Windows Operating system
PORTAUDIO audio output if you're using MAC X OS