Sir Elliot has released Loud & Clear, a free preamplifier effect plug-in for Windows.
This is a very basic preamplifier designed to bring forth the upper midrange frequencies. It works well on Rock hence the reason of the PA head look. Volume will be the least of your worries using this preamplifier.
Loud & Clear is available to download as a freeware VST effect plug-in for Windows PC.
More information: Sir Elliot