Download of properVOLUME 1.1.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This Mac app was originally designed by Plexus Publishing, LLC. The application is categorized as Audio & Video Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
properVOLUME is a menubar audio volume application for Mac. This app lets you quickly and easily change volume levels on any audio device without switching the default device. The application allows you to control your microphone level quickly and precisely with visual metering.
You may want to check out more software for Mac, such as Lounge Lizard Session or SignalSuite, which might be related to properVOLUME.